It can be done oasis. I am a self taught plasterer. Although i dont consider myself a plasterer it is something i do for a living. All i did was buy a trowel, a hawk, a bucket trowel, a couple of buckets and a bag of finish. I did one wall in my house, then another, and another.. I had no intention of doing this for a living. I was asked by many friends to do work at there house but i always said no as it was just something i did for myself. Then a plasterer friend of mine looked at my work and said if i carry on ill make him look like a kunt. I was never confident enough to do work for anyonelse but the more people asked the more my confidence built up. I now work for developers, builders, glazing firms and basically work from recommendation.
I still feel lucky to be doing what im doing even though this is not my chosen career.