Recording vocals is a gentle process, not only for artist, but for recording engineer too. There are several things that you can go wrong. If you manage to avoid these common mistakes you are on your way to record fine vocal tracks.
Mixing drums is surely one of the most difficult part of mixing music. How to make a punchy kick that has big sound but not too big? How to make a great sounding snare track? Of course it is also question of how the tracks have been recorded. But you can still do a lot in the mix even if the recorded sound wasn´t perfect. Take a look at this initial of forthcoming Mixing Tutorial.