Yeah , I have this problem, too. I started cutting their hair myself. I was scared at first, but it seems to not only be working out, but saving me a lot of money, too. My problem wasn't my stylist. Her name is Sam LeValley, and she is at Violet's Salon across from Great Lakes Crossing on Baldwin. She gave the boys a haircut, and it turned out really good. My only issue became that the boys really hate going to beauty salons, and they don't want their hair cut period.
In general, I trim to the length I want, I usually layer it somewhat by cutting at an angle and then I take the hair between my fingers and point the scissors up so that they are just thinning out the hair and not making it look like I just gave them a page boy cut. I think it is hard to explain, but I saw that technique on TV once, and it seems to work.
I kind of miss just going to the barber and telling them to "shave it!"