I think simplycee's method is a good one. And no you don't have to comb out till all the shedding stops as you will end up with a few hairs in the comb everytime, remember the hair hasn't been combed out in a long time so all the hair that couldn't get to do it's normal thing, will -- now that it's free. Just make sure you detangle, get all those pesky knots out! To cut down on the shedding I use Nutrine Garlic Shampoo for my second shampoo, the first one is always CON as that detangles and softens my hair like no other. I also use the Nutrine Garlic Conditioner, it has aloe and castor oil so it helps with softening and the garlic cuts down the shedding dramatically.
HTH
Deby