a lot of these are somewhat similar, so purely for diversifying the responses somewhat, and perhaps for argument's sake, I'll try to make a different 5 steps
I'm the only one I know personally that understands and accepts the looming problems of peak oil (and its convergence with fractional lending, environmental problems, etc etc) OF those people who I think are SOMEWHAT preparedness-minded, (maybe they own a gun or keep a little food stocked just in case) I have asked the question, "For the sake of argument, if the peak oil scenario does happen, what will you do?" It usually boils down to (after discussing the limited options and realities of the situation) "Well, I'll just have to take what I want/need from someone else."
Postulate that there will be a hard crash and a bottleneck you have to get through that will last say a year or two. People will want to "optimize" available resources. The government, community, and individuals will want to redistribute by guilt or by force, anything that will be useful during the crisis until there are no more people, no more crisis, or no more resources left to redistribute.
Starting with a given that there will be a survival bottleneck,the worst portion confined within a 1-2 year time frame with a major die-off, then any preparedness plans must first and foremost deal with how to get through it. I for one also take as a given that I am determined to try to be neither a victim, nor someone who victimizes others.
1. have everything you need to get through a year. two years would be better.
Your gardens may be pillaged or destroyed, not to mention call attention to your location. Animals would be noticeable too. Fruit/Nut trees may not make it through this time, as "optimization" of resources will mean that all trees available to be chopped down for heat in the winter WILL be chopped down (...until winter ends, everyone dies, or you run out of trees) In a hard crash, I imagine growing food will be prohibitively difficult so long as people are alive that are not prepared.
2. have a place to keep yourself and your supplies safe
You will not be able to move the supplies you need to get through the time of troubles. I was hard pressed just to carry 1,000 rounds of ammunition to my car, let alone all my food. I would not want to be caught out in the woods with a 3-day go-bag, two clips of ammo, and nowhere to go. I fear that if you cannot keep your stash, you may be hosed per #1. So have a Good Place for the Stuff.
3. it is best to be hidden or for your location to seem undesirable in some way
The place with your stuff needs to be either hidden, inaccessible, or impregnable, and I'm not a fan of attempting the impregnable route, at least not as a first line of defense. I can see this going one of two ways... purposely choosing an undesirable location, or defending a desirable one. A place in the desert on the one hand, or good farmland on the other, away from a city could be places to consider.
I imagine if you were in a valley with THICK, MULTIPLE well-placed hedgerows, brambles, poison ivy, etc. covering the approaches in depth, you might remain in a very pleasant island of calm for the entire crisis... everyone coming your way might find other routes more desirable and simply turn aside. I've been thinking a city location would be much like a desert location. Given an extremely defensible and innocuous position, it might be a good place to weather the storm, (6 stories high in a large all-concrete apartment building for instance...) precisely due to the location's undesirability. Along the same lines, perhaps a suburban house with a large basement with a WELL-hidden entrance? If the ceiling of the basement was concrete, perhaps there could be a well-planned way of burning down the upper wooden part of the house in the event of permanent unwanted squatters moving in? The ruins would indicate that property was already "tapped out." Anything to make the place hidden and unattractive.
People will not want to lay down and die. If they see you have something they need to survive and they or their loved ones are dying, they will have to at least give taking it a try. Best to hunker down in secrecy so you don't have to shoot at anyone or be shot.
4. You will probably have to go it alone through the bottleneck (along with with loved ones)
I really do like the idea of community, but in a hard crash, some will be less prepared than others. By what margin will they be unprepared and by what margin might you scrape by? In a crisis situation, you'll be compelled to contribute in the same way we contribute food to africa and make matters worse. All that will matter is that people are starving/dying NOW and need help. Human compassion dictates as much. Even if all members of the community are in fact ready to get through the time of troubles, each fully prepared to pull their own weight, they will have varying levels of hard-heartedness. Unprepared people will show up. If just one person in your prepared community "lets them in," the same rules apply as above... they are now part of the community and deserving of compassion/aid. This would also increase the number of people willing to let still more people in. HOW MUCH of a margin will you have in your plans for yourself and your loved ones? Are you prepared to get 5 extra people through a year? 20? Acts of both callousness or mercy could easily fragment a community through disagreement or "optimize" its resources to the point of not making it through the crunch. A community will be hard to hide, and possibly difficult/heartbreaking to defend. Who wants to gun down a nice bunch of suburban families because they're breaking down your hedge to get to your nut-bearing trees to chop them down for firewood? Not me. Worse yet, who wants to get gunned down by them? Given the necessity of a stash, one must go it alone (preferably using concealment)
5. Be prepared for the aftermath.
Be prepared to emerge to plant crops and form a community with the people who were as prepared as you... once the crash is complete, NOW it is time to form community with the prepared people who made it through. No longer faced with an overwhelming demand for your own meagre resources, you can afford to cut people some slack and see if they'll shape up to be a good neighbor (and expend some effort and resources on proving yourself one...), or confidently rebuff attempts to mooch (the moochers/looters ought to die off to relatively more manageable numbers, having exhausted all the resources they could get their hands on.)
Again, if there is a severe bottleneck due to a hard, quick crash, then the most important thing is getting through it. The next most important thing (to me) would be HOW you get through it. The way to get through it with the least amount of savagery (from others or oneself) seems to be isolation/concealment.
(edited out new guinea stuff, as it only distracts from the point of the thread)