I published my very first map lol. I do wanna do a house level, but cant decide if my childhood home would make a big enough level or not.
As for the main topic, I think small part of it is talent, or very least practice in other forms. If you've dabble in any other art from, you'll have a decent idea of contrast, composition, and form. Your practice might not have been in the editor but most creative endeavors have overlapping concepts you might not realize it until you do various things. Ive been doing art my whole life, but In a few weeks It will be a full year for me mapping.
It also helps UDB is easy to learn, but hard to master. So many shortcuts you learn over time to make things simpler.