It depends
I keep a full beard but I do trim it regularly.
Every morning, in the shower, after lathering up with whatever shampoo I'm using (lately it's been Head and Shoulders every morning), I shave my cheek and neck area with a Gillette dual blade "Plus Custom" dispo shaver. It lasts a week or two.
The beard and mustache get trimmed dry with a Wahl Motor Clipper. The kind with a slower revving reciprocating motor, not one of vibrating the buzz bombs. I use the #3 comb. I'm able to do this in the shower, before showering, so the clippings go down the drain. Yes, the outlet is a GFCI kind ;-). Then the mustache will get clipped manually with a pair of barber scissors, also periodically, usually in the shower.
The Wahl motor clipper also comes in handy for other areas.