I recently dropped an oil pan on a 3/4 ton Chevy. I also had to drop the front axle a bit. On the way to the shop where I did the work, I picked up a box of 1/2 cup canning jars. I took the tops off and arranged the jars in a row. As I disassembled things, I place the bolts in groupings in the jars, starting at the left and working right. With the jars being clear I was able to clearly see the bolts. When re-assembly everything I just looked at the jars and brought out the bolts and nuts and worked right to left. It was a great way to keep me organized. I'll certainly do it again. What works for you?