I take a more relaxed approach, net them out when convenient, but don't panic; so far, I haven't had a population explosion, maybe because I don't feed that much.
I started a guppy tank about three months ago. After a couple of weeks I noticed a few snails in there, which I assume came in on plant life. Three months on I have HUNDREDS of snails. It's awful. I disposed of about a hundred of them this morning. It's taken me this long to do it because I felt so guilty...