Don't get frustrated with the cutscenes and tutorials. They can last a while, but if you stick around it's a lot of fun! A lot of people missed out by quitting before the ending, which was really pretty cool! The battles are more difficult than in regular Sun and Moon, so over leveling isn't that big of a problem. Use Pokémon refresh a lot, you get some neat bonuses in battle, like more critical hits. Likewise, use Poké Pelago, to get beans for feeding your Pokémon. Visit the cafe when you feed your team a bunch of beans, since you get rare candies. Anyway, that's about it, hope you enjoy the game! It's a lot of fun once you get into it.
(Edit: When I said "which was pretty cool", I was talking about the ending. Looking back, I could've worded that better. Whoops)