Lay the guitar track down ... then practice singing to it ... record yourself so you can listen back to it. You'll be your own worse critic. But you can learn a lot, unless you believe you're a perfect singer already ... then ... there's no hope for you anyway ;-)
2 PRS Custom 24's
PRS Tremonti SE #7 Pickups
Gibson SG '61 Reissue
Warmoth Guitars (4)
Fender Tele
Gretch 5120 w/ TV-J's
Mesa Nomad 100 & Rect-O-Verb
Fender Twins (2) & Hot Rod
Acoustics - Alvarez, Lowden, Martin HD-35

Scott B