I haven't Bic'ed my head since college, but I always started with shaving cream. I typically started with the top of my head, then the sides and worked with the grain. Then I did the back with the grain next. I would then rinse off any excess cream and go against the grain using water. The back is essentially by touch, though it helps to have someone check on it once you are all finished to get the inevitable scraps you missed. The Mach 3 works great, so don't worry about getting another razor, just make sure you use a fresh blade, as you'll dull the thing by the end of it. Also, just remember to go slow. You have a lot more grooves and bumps on your head and you will get nicked up quite a bit no matter what, but you still want to try and minimize it as much as you can. Expect the whole process to take at least a half hour, if not an hour. Nowadays I just use my clippers and shave my head as I don't like spending the time to Bic it nor do I like spending the money on new razors.