As many others have said, I think you should follow your heart. But that doesn’t mean to do what is easy (ie dropping out of PT school).
You mention how expensive school is. What are the profit margins of being a PT and that investment? What are the margins of running a tree business in your area? Earlier this year I was having a major career dilemma. I would just sit and spin out on what I should do. Should I start my own company? Should I keep contract climbing? Should I get a job in California again? I put everything in a spreadsheet listing the pros and cons of all of my options and it all came down to contract climbing being the best use of my time and the best return on investment. In the column about physical impact though contract climbing was on the high end of the spectrum. Make yourself a spreadsheet listing out your options and the pros and cons with each of them. The fulfillment column might just be the most important one.
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A lot of people post the macho bs about how aches and pains are just a part of this industry and make the assumption that how you have to “make it” is by being a tree service owner or a cog in the wheel and beat your head and the rest of your body against the wall selling and/or performing work until by some miracle you feel you have enough money to retire or until Davey, Bartlett, or some other corporate giant buys your amazing company. Our industry and your place in it can be so incredibly diverse and potentially very lucrative. It doesn’t have to just be “I’m going to run a business or climb and beat the crap out of my body every day.”
Personally, if you have the passion to be a PT, have the smarts to get into PT school, and the financial burden isn’t too much to bear, I would go for it. All of us have your back and will welcome you into the trees if you decide it isn’t for you. I have worked with guys who have former careers as lawyers, mechanical engineers, CPA’s, and many other fields. All of them bring a diverse perspective and unique skillsets to the table. None of them ever made it seem like they regretted their schooling. Expanding your mind is expanding your options which is something you will never regret.