Yeah, if you go a week or so without playing, it'll be tough to stretch at first. You'll find it doesn't take that long to get back into shape though.
It's like most stuff on the guitar. Once you learn something, just because you stop playing for awhile doesn't mean you lose the ability to play. You just get a bit rusty and have to warm up.

Not sure about other videos on the net. I'm sure they're all over the place... it's just a matter of what you'll get and for how much.
Check out the stuff here. Every instructor has a couple of free lessons on their pages.