I didn't like the Goo-B-Gone stuff.
First, patience. Go slow and take your time.
Use a hairdryer (it's too easy to fry your paint with a heatgun). Get the sticker fairly warm, and then with your fingernail, just pick off a corner, and then gently pull. There should be little residue (if any).
If there is, I used the Honda cleaner (great stuff if you can get it!) to remove it.
Taking the stickers off of the metal is MUCH easier than the plastics...
Good luck.