raise, even in early position, a healthy amount to isolate against one opponent. Against several limpers, the likelihood that any overcard that flops will be in one of 3-5 opponents hands is probably very high and you only will win with a set.

that said, other than a continuation bet on the flop, i proceed very carefully when an overcard flops and there is resistance. I don't want to get caught on those JJ "fishhooks"!