My personal method is to do it in the shower with soap and water. I tend to spread some of the skin out in order to get the sides smoother. Basically around the balls first. You can hold them slightly away or to the side while you take care of the part you are focusing on. I do the taint as well.

For the centerish part of the ball, I normally hold it around the base and that smoothes out the skin on the balls. Then I carefully shave my balls. You can move the flattened skin around the ball inn order to make sure you got everything.

I would say if you start getting ingrown hairs, you might want to just keep it short instead of shaving, but that’s your choice.