Changing careers at 3 years into a job, is it realistic? - what worked for you?

I want to move from delivery driver to something with more stability. It has been weighing on me all week. I have a little time and a small budget for training. Did you take a pay cut?

Thanks for writing this out. I went through something close to it 3 months ago, and it settled down once I kept a simple log of every call and form.