My front driver side window went bad, and when I roll it all the way down, it wont go back up unless I take the door panel apart and pull the window up. (which is a pain). But I CAN roll my window down a little bit before it will fall off track and go all the way down. How much do you think this would cost to fix?

Start with asking your nearest GM dealer, they can give you an estimate for repair, then check with other body shops or auto-glass shops for estimates. If you are mechanically inclined you might get enough info from the estimates to tackle the project yourself.