Those tops are looking nice. How many weeks are they into flowering now?
One of the things I like most about trimming before harvest is it reduces the amount of labour when you actually get to harvest day. Lots of people use razor scissors (sectors) for trimming. I've also found that if you stabilize the crown in your left hand (but dont squash it) then slide a finger from R-hand down the leaf stem deep into the flower, push down, and the whole leaf and its stem will snap off quick and easy. Just my spin...