Changing careers at 15 years into a job, is it realistic? - any advice?

My layoff made me rethink whether to stay in my field. I have read a lot of threads here and could not find my exact situation. I have a little time and a small budget for training. How did you start?

I took a small pay cut for a year, and it was worth it for the growth afterwards.

Keep everything in writing and save the confirmation numbers. It made the follow-up calls so much easier.