Most of the opponents I find at the 25NL are quite passive. They are happy to call your bets with any piece of the board, but when they reraise you they generally have something. Then you need to figure out which ones show this aggression with TPTK and which only show it with 2 pair or better.

But generally just try and stay patient, wait until you get a big hand and then value bet, value bet and value bet some more.