I used Jonetsu's Fran's Shoe Guide (http://www.cosplay.com/gallery/71960/).
You should consult professional at a hardward store if you are unfamiliar with some of the materials or want to ensure that your shoes will support you.
If you lack upperbody strength and/or require supervision because you are child, get an adult.
1) Buy lucite heels because their heels are hollowed in the inside. Saw off the heels.