It is easy. Just be warned, now you have waxed the surface, you will not be able to fix any scratches in the finish with poly, since it will not adhere to the wax.
If you like the look of the wax, you likely could have achieved the same by buffing with a buffing wheel and Tripoli compound. This is what some woodturners do. The tripoli compound does not impact future finishes.
I normally just apply the wax then wipe off. Not sure what difference leaving the wax on for a period of time makes.
The wax will fade over time.