A whole lot of conditioner. I would recommend the conditioning balm sold at Sally's. A whole lot, apply starting at the ends while soaking wet and work it up then squish, squish, squish. Clip hair up while showering. Before rinsing gently comb thoroughly with a wide comb and I mean thoroughly, then rinse.
Would love your red thick hair. Mine is thick and brunette and very wavy. I also use the GF S&S Leave in, quite a bit, and love it!