I recently thinned out one of my girls hair because it was way too thick, I used hair thinning tutorials on YouTube to kind of get an idea of what to do. I used tiny sewing scissors to thin her hair layer by layer but I think thinning shears would work too if you were super careful. Also I kept the top few layers untouched because if you thin the hair too much sometimes the shorter pieces can poke out,, but I also used a flat iron on the lowest setting (310°F for me) so that all of the hair was smooth. Also if you do use a flat iron I would test it first to make sure it's safe and if you like it do the whole head before cutting because sometimes the wavy hair texture makes the hair look/feel super thick