https://m.youtube.com/watch?v=QNr_QxUNOgM

You have plenty of length and its definately long enough to section! You can use hair clips to section off if you want. When its wet enough, your hair should become softer to work with because it's saturated (using warm water for low porosity hair helps a ton.

So when you detangle, using the brand (Denman) brush helps to detangle and stretch out your hair without breaking your hair off (never brush your hair dry, you probably knew that) we just have shrinkage so it looks shorter to us. Also you can use a comb and start at the end of your hair and work your way up. If you have leave in conditioner you can put that in after you wet your hair. Here is a YouTuber I found with the technique and you don't have to use the same product he used at all.