Usenet Newbie - How do you get into private tracker?

Hey y'all! I'm pretty new to usenet and kind of overwhlemed with how many trackers are private. I got my eyes on DrunkenSlug and DOGnzb but it seems damn near impossible to get in. I got an NZBGeek subscription but want to diversify.

Any tips? For those who are "in" HOW DID YOU DO IT!! Thank you in advanced :)