Mine is accompanied viewer as I do outcalls. Showing people around houses for an estate agency, popping out to various locations for a few hours at a time.. I'm not sure it's a very good excuse but it's enough to explain a few outcalls a week on top of my day job.
If you're a beautician or hairdresser then just say mobile outcalls. Maybe even babysitting? Providing companionship for the elderly? There's loads of cover stories you can choose from, I think the seamstress one for incalls is genius!
Try to cover up how much money you earn, or people will get very suspicious and start talking, you may get accused of doing illegal things. The best thing it to put it in your account and try to act like you're just getting by and little luxuries are gifts from parents or aunts/uncles. It's frustrating having to act like the things I treat myself to are gifts rather than things I've worked for, but otherwise it would look suspicious. x