I play bass for my serious band, guitar at home, and drums for my "just a bit of fun" band, which is turning out to be quite good! The drumming itself is easy stuff to play, and i've been playing around with drums for ages, so it's not that difficult, but the stamina you need to be a rock drummer! I'm so knackered after 30 minutes of practicing I need a break!
I have my first gig as a drummer on saturday and i'm quite nervous about it, getting the kit set up right and in time, not making any stupid errors etc. I think mistakes on the drums will stand out way more than they do on bass.