8:47 p.m. on June 13, 2008 (EDT)
First question to ask yourself is why do you want to live off the land and/or survive in the wilderness. It is a nice, romantic dream, but for the vast majority of people, just not realistic. The second question is where have you spent your life - city, on a farm, in a true wilderness situation, or what? By true wilderness location, I mean, have you had to hunt and/or fish for food, have you gathered wild nuts and berries? Have you dressed game and have you preserved the meat/fish such that it will last and not rot (you won''t have a refrigerator)? How familiar are you with which plants are edible and which are poisonous in the area you want to spend your time? You aren't going to have a grocery store within a couple miles, and you aren't going to have medical facilities 5 minutes away with a phone call. Can you do advanced first aid on yourself and your companions - severe sprains, dislocations, broken bones, flu, pneumonia, other infections? In BC, you will also have to deal with critters like grizzlies (same if you go farther north to Yukon or NW Territories - I assume you aren't Native, so you won't be going to Nunavut).
Have you built a permanent shelter that will provide protection against the kind of weather you will encounter year around in the location you are choosing (if it's BC, this means serious blizzards in winter, and that includes dealing with potential avalanches)?
Can you cook, sew, tan hides, do carpentry (ax only), grow your own crops (know the crops for the seasons and dealing with pests from mite to large 4-legged critters)? Can you maintain your tools? For your hunting, can you reload your shells, or will you use muzzle-loader, or make your own arrows, if you are bow-hunting? You can't depend that much on re-supply from civilization, especially in winter when the snow is on the ground.
Are you familiar with the regulations in the area you are intending to spend your time in (sorry, you can't get completely away from the government)? In some areas, you can do the "into the wild" kind of thing, but in others, it is not permitted - know for sure about the exact location you are choosing. The regulations may forbid you to kill the local game, or allow fishing only during certain seasons, and may require permits for any or all activities (including building a crude lean-to).
A lot of the knowledge and experience can be gained by apprenticing yourself to someone who has lived in the wilderness for many years - a hunting or fishing guide, or by enrolling in a wilderness management program in a university. Unfortunately, very few people grow up away from the comforts of civilization these days, and have their concept of wilderness survival and living off the land from TV "reality" shows. Those folks you see on those shows have all trained and studied for years and are backed by large, well-equipped crews. People like Dick Proenneke are rare (he had lots of experience and training before he headed out).
I grew up in a wilderness situation, though not in a "wilderness survival" environment. Much of our food was gathered by hunting and fishing, along with growing our own fruits and vegetables. But we were close enough to town with transportation that there was no serious problem with getting a lot of what we needed. And we have get electricity in the main house (not on the land my father had homesteaded, though). It was 25Hz, not 60Hz, which meant that the lights flickered (kerosene lamps were much nicer). I still enjoy getting out in late summer and fall to gather berries.