Changing careers at 12 years into a job, is it realistic? (update)

I want to move from procurement assistant to something with more stability. This is my first time dealing with any of this. I have a little time and a small budget for training. Has anyone made a similar move?

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

Thanks for writing this out. I went through something close to it 5 months ago, and it settled down once I kept a simple log of every call and form.