What finder did you get? I got one decently rated thing on Amazon, and never did find anything with it. Broke it in a rage rather than even bother returning it.

Bought a cheap Hart finder from Wally World, and that thing is worth its weight in gold.

Also, if you have old plaster walls, good luck. I've never had any luck with those in my last house, and ended up just drilling to figure out the OCs.