Worth cracking on mate. Hit those silver metallic blocks in each level and it shows you where every moon is on the map, so doesn't take long to collect the next 200.... toadette alone gives you 25.
This last level there is 14 fkn difficult stages to get up to Bowser. All needs to be done in one take. Die and you go back to the start.
I'm right into it but would say it's definitely the most difficult piece in any mario game. I'm determined to finish it.