Look up Wilfried Erdmann, he was a famous single sailor who has circled the world a couple times. He has books on the matter where he speaks about the experience as well as the preparation and what kind of yacht he used. Very well written and interesting if you’re into that topic.
It shows that you can do it alone easily enough and that you don’t need some crazy high end yacht.
At least the last point is something you can do relatively cheap at most larger lakes or coastal cities in a weekend course. Sailing isn’t that hard.