Well I've seen my wife do it and seems to me that really good shaving cream and a good quality razor and taking your time might eliminate some of the irritation. I don't think she has too much trouble with it. But heck what do I know.
Preferably a non-scented one. You could also try baby powder after shaving, along with that they have moisturizers specifically for the bikini are after shaving to prevent irritation and itching like Bikini Zone.
Baby powder and women's stick deodorant. If I use that I never get rash/itching.
Baby oil works best for me.
Baby oil. Or coconut oil