first you got to find the right brush head. the one that came with my kit was the sensitive one, it was great since the bristles are longer it was easier to get into the harder to reach places like the sides of my nose and when i got to close to eyelids by accident it didn't really hurt when a couple of the bristles went over them. However by accident i bought the normal brush head twin pack. i thought i'd be ok since my skin was used to the clarisonc brush, not. the bristle are shorter making it harder to reach places and it hurt when it went over my eyelid.
also i notice that if you don't change to a new one in the 3-5 months you can get more pimples, so keep track of when you change them!