One piece of advice i usually follow but did not yesterday: go slow!
I put a deep, inch-long gash on top of my head that bled forever! This was no cut, but a gash that needed pressure applied and a first-aid kit. Who knew that not going slow with the razor could do that kind of damage!
On a superficial note, I had to put a square bandaid on it. At first i was embarrassed but thought to myself, I'm not the first to get a cut like this on my had and I won't be the last. Unfortunately I am at a convention and did not pack a hat. Luckily I was able to purchase one in town yesterday to relieve some of the residual embarrassment.