Hey Roshimitsu. Yeah, I definitely recommend giving it a go and it's not too difficult once you get the hang of it.
I started with some basic code examples provided in the documentation. There is a quickstart guide for each development platform. So for this submission I used the Javascript QuickStart guide, but you can find similar ones for other platforms, like Unity QuickStart, Unreal QuickStart, Python QuickStart, etc.
I was able to copy and paste a lot of the code provided there to log a player into PlayFab, and then other operations like adding a player's high score or getting the leaderboard is very similar, with the specific details for each provided in the API Reference guide. In particular, the api's for Update Player Statistics and Get Leaderboard.
I hope that's helpful?