I -just- made my first one yesterday actually. I'm 5'3" and it took two rolls of duct tape (like, triple thickness) and my mom wrapped most of me up, and it took about an hour and 15 minutes.
I just wore a tight t shirt and leggings. I had foam for digigrade legs, which were held in place by some tape applied before hand.
I didn't want my clothes to get ruined, so what we did was use the worlds' supply of paper towels (really only a roll if you spread it out evenly, I got 2 just in case
and wrap a section with the paper towel and wrap the duct tape around -that-, instead of your clothes. For support for my arms I used wrapping paper that comes in those tubes. And be sure to use the rest room and use chapstick before hand
This is the video I followed:
https://www.youtube.com/watch?v=YhsTAFIwHEwGood luck!!!