Yeah, transcribing is hard, but it does get easier with practice! Just keep going.

I've been working on one song, and it's played by a guitar player. In my experience, guitar players, especially "ear-taught" ones, tend to "swing" a lot more than piano players, so trying to get the right time signature and then rhythm for writing it out in classical notation is a little harder than with classically-trained pianists. I think I'm finally beginning to get it though. ;)