One of the remarkable things about fantasy football is that people who know everything about the NFL and people who know nothing about it come together to play every fall. Sometimes, the people in the latter group do quite well.
For example, someone who shall not be named asked me if they could take Houston Texans defensive end J.J. Watt two years ago (this was not an IDP league). Of course, that person ended up making the championship game out of 16 teams.
All fantasy football players, regardless of whether they know who is eligible to be picked, have the opportunity to practice their fantasy football drafts via mocks on different websites.