The earring, needle nose pliers, a white out pen, a fine black marker, a safety pin, and red nail polish.
First things first, your earring must dangle. Meaning, the part that goes in your ear must look like this:
That wire is your best friend. Use your needle nose pliers and start to bend that wire into a loop.
Use the white out pen to make a hour glass on the butt of your spider. It's okay if it's bulky or kind of messy, we'll fix that in a bit.
Once that's all dried and cleaned up, take out your nail polish and color over the white with the red polish.