A rusty Buck knife should do the trick!
j/k...keep it old skool (but not too old)...nice Gillette Fusion and some Barbasol shave cream. Get a mirror you can stick to the shower wall and have at it! Shaving while you're in the shower is soooo much better than shaving over a sink...
Hair Conditioner also works really well in a pinch if you run out of shaving cream...