Well, you don't just flip a switch. You need to go back to grad school and get a JD degree, which is 3 years full-time, and then pass a bar exam. Law school was not especially difficult, but it was a lot of work, which was fine. The bar exam is brutal.

The bigger point is that I never recommend this to people who aren't sure. It's really sad when people spend 3 years and accrue a ton of debt and then realize they hate the job. So I always recommend getting a job in the industry first and trying it out. I did that, working as a paralegal for a couple years first. It was time well spent.