Super simple. Brush in long *gentle* strokes while pulling your pets skin taut. Don't pass over the same area too many times, instead repeat the next day if a ton of hair is still coming loose after several passes. When the comb gets loaded with hair push the tab on the back (self 'cleaning'). If your pet is ok with combing in general, this wont freak them out. I always let my dog sniff/lick/paw new tools and give him a treat before the first few times. This doesn't hurt them unless you press too hard, test in on your own skin if you're unsure how much pressure to apply (its not sharp or anything, it's pretty safe). But you should not use this on their head, legs, paws, or tail, and anywhere they don't have much hair (like their belly).