Changing careers at 7 years into a job, is it realistic? - any advice?

After 7 years as a bookkeeper I am thinking about moving into a different field. I have been trying to stay organised about it. I have good customer skills and I am comfortable with spreadsheets. 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 11 months.