I'm trained in interior design but in some areas it is very hard to make a career out of it. In my old area, I never really tried but if I ever move to an upwardly mobile or affluent area, ie one with more disposable income and who are more likely to buy in services then absolutely.
To be successful you have to know your market and demographic and be able to target it effectively with your services, at a price point that means you can pay your bills and make a living.
As with any career I suppose.