Changing careers at 15 years into a job, is it realistic? - 3 months and counting

I want to move from store manager to something with more stability. I would rather hear the honest version than the polite one. I have a little time and a small budget for training. Has anyone made a similar move?

I began with informational chats, then a short online course, then a related entry-level role. It took about 3 months.