Welcome aboard!In the beginning I would do with the grain, but when your skin gets used to a razor, against the grain is better. Nice tattoos, btw
I'm an against the grain shaver, it gives me the smoothest shave. As long as you take your time wile you're learning and letting the skin get used to the razor, you shouldn't get any irritation. Don't press down hard and let the razor glide and do the work. Also make sure to splash your head with cold water afterwards, or as some on here do, rub an ice cube on your head after you shave and that will reduce any kind of irritated feeling. I also use an aftershave lotion that helps cool the head and gives it a nice shine.The tattoos are dope! I have several myself and would like to sleeve up.