Find all the things you will need.
Collect them together.
Fill shoes with paper to avoid any spray paint to smudge the insoles of the shoes.

Find an old cardboard box and paint the shoes with red spray inside that box.
Then spray the red paint all over the shoes.

Or do painting outside if the weather is nice.

Paint one side and wait. Paint the other side and wait more. Paint until the shoe is nice and red.

Paint the other shoe red.
Paint and wait. Paint and wait.
Wait more and let the shoes dry.

Then paint the outher soles of the shoes green. (or with any other color)

Cover the shoes with thin layer of glitter red paint.
Wait and let the glue dry.
Repeat multiple times until the red glittery outlook of the shoes looks even.

When shoes are totally dry + they look nice and even, add finishing touch to shoes with thin layer of clear spray varnish.

Congratulate yourshelf. You have made a nice pair of Ruby Red Glitter Heels.

Follow the Yellow Brick Road and find your way back home.

...'cause Dorothy, There is no place like home!