First of all, I don't comb my hair when styling it. I usually finger detangle my hair and then style it. As I do each twist, cornrow, or braid, I unknot any tangled hair. This works well for me, and helps reduce so much breakage.
Before you allow anyone to do your hair, you should tell them how to handle your transitioning hair. I made sure to tell my friend that I did not want her to comb my hair. Whenever, she encounted a knot, she tried to undo it, or she let me undo it myself. Yes, it took WAY longer than it should have but I was happy about the experience and the results.