Yep,just try and peel as much of the screen off in one piece as you can.as long as you don't apply pressure onto internal parts or go mad pulling bits off with a paintscraper or other oversized tool you should be fine. Put on a pair of goggles..those shards can fly! I've just taken 2 cracked screens off 4g's and I didn't use the heat gun at all. Most small pieces seem to stick to the adhesive and then you can peel that up. Just remember to take the metal "shield" off the top of the digitiser glass..you'll need it.