I got it done eventually! I find it quite hard to describe exactly what I was finding fiddly! I think it was trying to get my stitches even when they're underneath the binding and I couldn't really see them to be sure they are even. I'm not sure I did a great job, but as it was my first attempt at it I'm still pretty pleased with it!
I find it a bit odd that I didn't really enjoy doing it by hand, because I love hand quilting and I'm currently hand sewing a hexie quilt and really enjoying that. I don't think I would like to do a large quilt this way, but I might find that I want to on my hexie quilt, as I intend to hand quilt it for continuity so who knows!
Thanks for all your comments, and sorry I wasn't more specific about the fiddly!