No one is privy to the information on your tax return but you, the tax man and your accountant. Equally, if you worked in a normal job as well, your employers would not be entitled to that information.
If you do not have a accountant, then fill it out with whatever suits your costs. Mobile therapist, aromatherapist,hairdresser, beautician, life coach..
Whatever you feel like being really, and if you plan on claiming back your expenses such as petrol then you need to be realistic. Also, remember that the accounts you keep are important as they can be requested at anytime.