Step 3: The Long-Term The above steps handle the direct actions of grooming. While we respect your lifetime of experience in the shower, you need to treat your bum differently after it has been groomed. If you plan to follow the trim with a shave, then use the closest guard setting available. As for those of you shaving, triple all of this advice. That will make the shave much easier. Under no circumstances should you trim your ass with no guard at all. The first is that the Lawn Mower uses high-quality steel to ensure those blades stay sharp. You have a lot of hair clippings on your ass. You now know how to groom your ass hair like a gentleman.