Showering before onsen: you wash everything… right?

SO sorry if this is strange to ask, I have a gut feeling it’s just common sense but I think I just have social anxiety so I wanted to double check LOL

I’m visiting Japan really soon with friends and one bucket list thing we want to do is go to an onsen together.

I don’t mind the actual onsen part, but I guess I’m a little hesitant about showering…?

Do I shower before and after soaking in the onsen? Am I supposed to wash my hair 😭 And how the hell do I wash my private if I’m sitting down?? 🥲 I don’t want to just have like my hand up my ass and embarrass myself but I also don’t want to be gross and go in not fully clean?

Is there like.. onsen shower etiquette where you shouldn’t shower right next to someone else like urinals?? 😭

And for my friends that are girls, is wearing makeup seen as rude in the onsen? Even if they’re not putting their face in the water?

by Nearby-Item5039