InToDeep, your learning experience sounds a lot like mine. There's lot of good advice in this thread, I think one key thing is to make sure that you have the guitar part (pick one that you want to sing over) down to the point where you can play in time with the recording without problems. Then work in the vocals, even if it's just a word here or there, bit by bit. Keep at it, and give yourself credit for every little success. Keep at it. I pace when I practice, and I have stumbled into walls while working on this. Keep at it. The first song is the hardest one, they'll all come more easily after that (unless you choose something stoopid hard!). After you get over the hump, you'll wonder why it seemed so hard before.