If you’ve only got a few sheep you probably don’t need to footbath them, but if any go lame, tip them up and have a look as soon as you can. Don’t trim. A spray of blue spray normally fixes things before they turn nasty (blue spray from the vet, not the purple stuff you get in country stores). If you do want to use a footbath, I’m using provita Hoofsure endurance which seems pretty good, and doesn’t require a stand in period. Or goldenhoof, though I never had much luck with that, and standing them for 5 mins was time consuming.
Generally leave feet alone unless like you say they’re excessively overgrown. The breeds you have are pretty tough. Sometimes in the winter bringing them in onto dry standing for 24 hours can help dry their feet out, if it’s excessively wet.