Playing MIddle/low pocket's pre/post flop

[pipster]

How does everyone play middle and low pocket pairs? Do you call into an unraised pot and hope to hit trips, only betting if you do? Do you raise pre-flop and hope to isolate against 2 overcards and then take it from them on the flop if they miss?

I have generally been playing a combination of the 2, calling in early position and check/raising if I hit the set. And trying to isolate/buy the pot from late position.

COmments? Feedback?