It will come together for sure. I remember picking up 40 pieces of 16' molding and thinking, "Holy Crap!" I think you've seen my crazy side walls and the multiple layers of trim. So I feel for you on all the ins-and-outs to come. I think you have the same miter saw as I do, which was a God-send in the end. My old single-tilt, non-slide Dewalt would have never cut it (no pun intended).
It is amazing to see it when it's all up though.