Oh please help me.. I'm stuck at this one fast riff in Sweet Child O Mine
http://www.youtube.com/watch?v=mIVrZWLlDkA 4:10-416 (the fast one)

It took me less than one day to get to this part, and I've been practicing this riff for around a week now, and I'm still not fast enough. I can tell I've gotten faster, but am I suppose to keep practicing this riff until I get it? Do I forget this riff and go to a new one for now? help please~!
do it in parts, divide the lick in half and start working on it.
ofcourse youll have to start at a very very low speed and go up when you feel you got the lick perfectly at that speed.