Shaving and giving head

I️ use nair to clear all the hair off my vagina, but after I️ use a razor to go over the parts I️ missed. I️ have these dark marks I️ want to get rid of and ingrown hairs. Any tips on how to shave down there? I️ feel like my vagina is ugly and razor bumps will turn people off.

Next, I️ want to give good head, but I️ currently have braces. I️ just want to make sure that I️ won’t use teeth and I️ won’t gag too much so any more tips??