It can take around 300 x4.5mm stones to do two heels and 100x3mm +100x 2.8mm flat stones to finish it off.
Time wise can take anything from 2-6hour for heels,depending on the pair of heels and size of stones, too small a stone and you will be there all night.
You will need -for Stoning a high heel- roughly for a size 4:
Flat back Rhinestones*: 1500 x 4.5mm + 100 x 3mm + 100 x 2.8mm for one shoe
*Swarovski Crystals can be found on line and I tend to use these as the quality is better and they give a better sparkle.
Glue : need a glue that dries clear and wont melt the stones if your using plastic, I use applie glue that the bead shop sells, but I might use a stronger glue UHU on the stones that get the most wear, eg toe and inside shoe faces that can rub against each other but its far more tricksy to use.
Cocktail sticks : Can chop the ends off for a blunt tool.
White tack : For the ends of the cocktail sticks...or you can use a cotton bud dipped in melted candle wax and left to harden.
Pins : Thin long dress making pins will do nicely.
Cotton thread : To help as a guide line.
For Spraying a pair of shoes first: Hobby can of spray paint/Duct or Gaffa tape / Box to spray in or newspaper / Tinfoil (bakerfoil) / Face Mask