[jimbob45]

The 3rd movement is not one of the hardest pieces to play. It’s like medium-hard. It’s not even the hardest sonata - that would be the Hammerklavier.

[chopin]

If one wants to play a well-known sonata I'd rather start with the Tempest. Considerably easier than Moonlights 3rd. And as beautiful imho, the 3rd movement especially.