Best of luck with the change, I have done 40 years in the motor trade covering most aspects always self employed and still look forward to every day. In other words I hope it is the trade that is your problem and not you, that way you will hopefully enjoy the new one.
I feel sorry for anyone stuck in a job they hate, I have been lucky I know to be able to change what I do when boredom sets in most people cannot do that without a lot of effort and support. For my current trade I practised a minimum of 3 hours per day 7 days a week for a year all this after work or before, that is what it takes to change things sometimes.
My current thing is PDR, the OP may know what this is others may not.