First I have to totally disagree with the statement "Making a living in entertainment is no harder than other professions ... if you learn your craft" Entertainment is one of the hardest and least secure forms of making a living . There are so many variables in the business from the people who hire you to the crowds you play for. I knew so many musicians that were going "full time" back in the day and making just decent money. I can only think of one who's still going and only because his wife has the solid job with benefits and a good salary. My own private teacher years ago choose to work for the PRR instead of doing music full time and he came from a time when musicians were more respected and opportunities much more prevalent. Recently saw an interview with Michael Buble and he said something really true. It's 20% talent and 80% luck. Every person on the "Voice" can sing well so why did I make it ?

Back to topic. Simple. Just canvas your area and see what's available, be prepared with material and equipment to cover all situations, and follow some solid business practices as Gary has shared. Definatly no guarantees but give it your best. Good luck.