shaved my dome every 3 days for almost 8 years...
always straight razor, those cheap ass blue gillette throw-aways worked better than any of the new mac3 BS's...
Go against the grain, go slow. You'll cut yourself no matter what the first time and many thereafter, but dont worry it'll get better. About 6-8 months after doing it consistently, I could shave my whole head w/ a razor w/o water or cream and no pain...head gets raw pretty quick
..
have fun!
FF