Lately I tend to genocide them (the trolls) because of the tougher
ones you meet there. It's not that at that stage you couldn't handle
them in melee, but they are annoying, get in your way of the task you
have, and distract you from events/messages you may want to get aware
of and miss. A tinning kit (if you have one) is probably the second
best decision. With gloves, another option is stoning the critters;
having levitation is handy in that case (to not fall into traps) or
have a lot of discipline WRT meleeing and moving.
WRT the wands question; having reflection and magic resistance would
prevent your barbarian from suffering from the worst wand attacks.
Janis