@Prints Avoid Ahhh I'm so sorry I didn't notice your post sooner!
As for your question, sadly no one has joined "well" recently. Not many people have joined since a few months ago, and those who joined usually made a character, posted a post or two, and disappeared. If you can be an active poster, or even just a poster who sticks with it and doesn't disappear, I don't see why you wouldn't be able to "get into it." Size and history, although "scary," is negligible -- you don't have to read a single bit. At all. No info needed other than the rules covered in our opening post OOC. Throw any and all questions at me OOC or over PM, and I'll get back to you asap, or maybe one of our friendly users will beat me to the punchline xD
The RP is mainly user-run and self-driven, although most of our members have ended up forming duos or trios when posting since individual posting gets boring. It is, however, completely possible; I myself have a "solo-posting" trainer/character, although I will admit that it's hard finding willpower to post for her frequently (more lack of enthusiasm on my part than difficulty posting). If you're concerned about having to post alone, I will say that I'm planning on rolling out a new trainer sometime soon. If you want, my new trainer can "tag along" with yours, unless one of the other existing "groups" interests you.
If you're looking to join one of the existing duos/trios of users/posters active right now, you will have to brush up on a little information (since most of them are involved in something or another, or are in-transit to some new location), but all the "brushing up" it'd take would be a brief explanation from one of the members of the group. Tagging along in a group would require you to be more "active," and our current members usually post every 1-3 days or so (I do, at least). But, if life gets in the way (or anything, really), just tag us in the OOC and tell us, and we'll figure it out. Plus, posting has slowed down some as of late, so you'd be able to scrape by with a post every week (although I'll be sad if you're in my group and won't respond to me until next week ;) )
Really, I don't see why someone couldn't hop in and start posting. It might take some getting used to, yes, and you might trip up a few times (I did), but I'd be happy to help, and so would our users. Our group is currently getting rather small, and I think the prospect of a new member would be more exciting than anything. So, just be an active member and poster, and you'll fit right in!
Well, hope that long drabble helped you figure out whether this RP is right for you (and convince you to join!!). We'd be happy to have you, so head on over if you'd like and start chatting in OOC! It's currently rather devoid of actual conversations, but I'm sure someone would be willing to chat :)