Make sure you know the clipper size or have a photo of the style you want.
A buzz haircut is wash and go.
This will make your head look rounder.
If you're feeling adventurous then you could go for a fade on the back and sides, but otherwise keep some length in the sides and part the hair where your hair naturally parts.
Crew Cut Getty Though purists may disagree, the classic military crew can be considered a buzz because it can be done with clippers.
The longest hair is at the front and it gets shorter as you go backward to the shortest hair at the crown.