I found the best combs were the cheap plastic nit combs.
Best Top: wet hair and use some conditioner and use an old white cloth (rip up and old t-shirt) and after each downwards stroke, wipe comb both sides on a clean bit of the cloth, make sure there is nothing on it before putting it back into the hair.
yes t-tree oil - couple of drops on head and massge through first.
wash everything every day, bedding, pillow cases, towels.
when they have gone, always tie hair back and check.
if all else fails, cut hair a bit shorter to help process!
boys get them too, even with short hair, bit it does cut down on the combing!
good luck