I was taught a way a while back that helped me a lot.
Look at the song in general, evaluate the hard parts (tempo changes, solos, ect..) that you think will make you struggle.
Then concentrate on them one at a time. Slow it down (Branislav technique would be good here) and bring the tempo up gradually.
The thing is to master the hard parts first by chopping them into small parts and then bring them together. Also when your frustrated on one particular part, forget it and go to the next. Come back later and I guarantee you you're going to be better.
Say Branislav, what program are you using to slow the tempo. Hope it doesn't change the pitch :)