Well, I got the "size 1"-xs in the Zoots. Based on my waist size, I was an x small. Maybe I could have gone up to a small, but I felt that the compression might not be as good? I mean, DH got the small and he is 6 inches taller and 40 pounds heavier, so it didn't seem an option.
I didn't have as much trouble putting them on after my run. It's the foot part that's tricky. I felt like I might rip the stirrup part if I wasn't super careful. Once the foot part is on, they go up fairly easily.