Not to fear! It does take a little getting used to. The categories themselves can be confusing with their various and sometimes idiosyncratic requirements, similar sounding categories, overlapping categories, and a general hodge-podge organization. But, you'll get used to it. It won't be the last time you have to resubmit a waymark. After doing quite a few over the span of several years now, I still get it wrong sometimes and have to start over, correct or revise, or just junk a waymark that I've messed up on.
I think you'll love it, though, and find that this is a lot of fun, and we're all here to help each other - even our imaginary friends.