For my birth last year I declutted, brought up a lamp in case I labored through the night, and set up a playlist on our computer. I wouldn't go for spa music, or anything I wasn't farmiliar with. When I was laboring it helped me to have music that I was very farmiliar and in love with, mostly Radiohead but some other songs thrown in there. That was the only way I would be able to focus on the music. If it was something I didn't know really well it would have faded into the background and not helped me.
I also read Ina May Gaskins' Guide to Natural Childbirth, which really helped me, in a large part because it talked about the way many women labor comfortably, in our society, and in the cultures throughout history.
I ended up hanging a rope from the ceiling so I could use it as leverage to help me push (didn't end up needed it though).
Oh, and my nesting included painting most of the rooms in our house. I think that helped a lot, since at the time we were living with my FIL and I was not really comfortable in that house.