Use a normal razor and shaving cream after getting out of the shower. My beard is inexplicably red and thus blends into my face and eliminates the need for daily shaving except on special occasions, but it comes in fast enough that waiting any longer than maybe three days and it becomes exponentially more painful to deal with. I'm afflicted with abundances of hirsuteness, and I sometimes try to trim other places, but a combination of lack of flexibility and the speed with which it returns prevents me from getting too involved with shit like that.