I'm having troubles with singing and playing at the same time. I'm taking it really slow and learning some old john lennon and oasis so i can sing along. but when it comes to something like metallica where i can play the leads with my eyes closed, i'll mess up over the easiest riffs (like the chorus of enter sandman). I'm trying to get my vocals up to par so i can do backing vocals for a couple of shows i have to play playing nightwish, bodom, opeth and in flames covers. Is it possible to learn to do so by novermber?

thanx