Changing careers at 13 years into a job, is it realistic? - what worked for you?

After 13 years as a delivery driver I am thinking about moving into a different field. Thank you in advance. I have a little time and a small budget for training. Has anyone made a similar move?

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