Remember it'll grow back.
Are you going to shave it or close trim?
If its trim use a pubic hair trimmer, much shorter and less plucking of hairs and doesn't cut the skin. After this you can shave but I would recomend oil over foam, and use quality disposable razors two or three passes on the whole head and then replace the razor. After three cm swipe rinse the blade out well getting all the hair out. I think its better to use leg hair disposables and try not to use excessive preasure.
Sorry if I'm teaching you to suck eggs but its advice that I wish was given to me when I first started shaving my head.