When I became interested in the game, the only things my dad told me was "hit the cue ball above center to follow, below center to draw or stop the shot, and left or right english to get position on your next shot off the rail." My dad never taught me or showed me how to "properly" stroke, bridge, position myself or any other mechanics. I had to go through hundreds and hundreds of hours of trial and error, failing, frustration, breaking 2 sticks (yes, I'm sorry) and so many more things for me to finally get things right. I'm so glad that was all he taught me. All that suffering I went through made me appreciate the game even more. Those who go out and buy an instructional DVD from the get go, are taking a shortcut. They are also copying someone else's style, stroke, etc. instead of building their own (not to offend anyone who learned from a DVD).
That being said, I'll let my friends find out things for themselves. Not to be a jerk or anything, but they'll feel good when they finally become good players and know they did it all by themselves.