based on all that extra info, I say go with your gut, and its telling me you would rather work for yourself than be unhappy working for others.
the only part I disagree with is charging so much less than the other guy. Charge ten dollars less but do everything in your power to let all potential customers that you offer far superior service n training. A gimmick that works well is always to say that you also receive XYZ at no additional cost which is worth say $45 (but it only costs u say $10 bux).
Keep revenues close to your competitors n throw in a curve ball to get the punters to u instead of the other bloke.
Your experience alone is worth a lot to your new business, promote that like hell. No use being the best at something unless u tell people about it.
We have similar businesses up here on the Gold Coast, most ones u ring go to a call back service or a answr machine. That shits me to tears. Always answer the phone, or redirect it if out of range to someone who can, and u will get the customers. People hate automated ph services or leaving messages.
Sounds like u will be underway in your own business sooner than later.
Your passion for what u do is what will make your money when the clients see your professional n friendly attitude. Then referrals is the most important part of every business that most don't bother with n miss out on massive revenue.
Good luck with it Blair n I reckon you will make it work.