Get ready to spend 2-3 hours to complete this and you'll need two people to do this for you.
The cast turned out ok, it broke in the middle and I had my family do a second cast with more material in the middle.
I'd suggest having a professional in your city do this for you. As a pregnant woman the last thing you want to do is be in one position for several hours, it is tiring, a professional would be able to do it much quicker and you will be satisfied with the first end product. I found out that there was someone in my city that could do it after having tried this twice.