If you have an extra prop nut. Just tighten them together on the engine shaft. Hold the outer nut with a wrench, and unscrew the prop. by hand.
If a spinner is installed the spinner backplate will stop the prop from unscrewing.
You can also use a two jaw pulley remover, from the auto parts store. Remove the supplied jaws, and replace them with zip ties, wrapped around the tools' frame, to the back of the propeller hub (crisscross them). Then carefully thread the pullers' screw onto the engines' propshaft, protecting it with a small piece of wood, or plastic to protect the end of the shaft from damage.
Then gently apply pressure with the pullers' screw. In small increments, until the prop pops loose.
Of course tower hobbies also sells a complete puller set to make this job much easier