I have a question which I have yet to see posted here. How do you shave your existing hair while being careful enough to not shave your horseshoe hair? I am a NW2 with diffuse thinning and when I eventually pluck up the courage to make the transition I will need to shave my top hair off. For the first time I will get a professional to do it ... but then what? It will keep growing and I am worried I might overshave some of the hair that I am meant to keep. I assume I will need two mirrors and constantly shave the growing thinning hair and be careful not to go over the edges? Sorry if I haven't explained this well but I would really appreciate some replies from those who have to keep shaving their thinning hair.