It depends on a lot, for example: how good you are, how much advertising you are prepared to do, how long you are planning on building your client base, etc......
It takes time to build a base of regular clients especially working from home with no shop front. I am mobile, I have a nice base of regular clients but I've been doing it for nearly 6 years. If you are expecting doing nails to be a quick way to make a fortune you are sadly mistaken.
You need to have funds available to hone your new skills as well as tell your potential clients where you are and what you do...... On average you need to do about 100 sets of nails before you are happy with the nails you produce, so you have to be prepared for that as well.
The reason you have not had any replies is it's not an easy question to answer as you can see by my rambling!
Anyway, hth's