Anecdotal, but my brother does tree maintenance. His minimum callout fee for a day's work is $2,000. And he often earns more than double that for one day's work. He does have relatively high costs, but his income is way better than what I earn writing code.
We're both at the stage in our career where it's time to stop being an employee and start running our own company and believe me, his company is more successful than mine. Early days still but my money's on him earning seven figures per year very soon.
He's so much more successful than that if my business fails, there's a good chance I will end up working for him. I'd be on minimum wage for several years while I learn the trade but I think it might be worth it long term and I can eventually pull my connections (the boss being my brother) and get promoted to being a manager with a cushy job driving a company car between job sites.