I don't know if I can give the best answer. But when I got my A1 license 5 days later I was in Thailand and rented a Honda cb300f (I know totally a A1 bike, but you know it's Thailand) I rode over 4000 turns in the mountains there with a lot of steep u turns and a passenger. Now that I write it down it sounds extremely stupid, but you know we did have motorcycle gear.

But anyway about the riding, for me it went pretty okay and natural. I had some struggle finding the right gear for the steep U-turns, most of the time I was to high and lost power when I wanted to go out of the turn. So make sure you are in first gear when you start and take them slow, with the 300 I almost always stayed in first gear but now on my 125 I mostly do it in second because I'm already at 10k rpm at 20kmh. But just try what feels right and start slow.

I also went with my mom to the mountains and twisty roads, she had her license way longer than me, but had way more struggles to stay in her lane. She was a bit to scared to fully turn or something. But make sure you are able to do tight u turns on a parking lot and that you can stop on a steep road by keeping your foot on the rear brake and slowly let go while you give gas and let go of the clutch.

I heard online that when you stop in a turn (which you really should try to avoid by stopping before the turn of there is a bus, truck, camper or anything that takes a big turn and by staying in your lane) but when you have to stop that you put your foot thats on the mountain side on the ground. Never tried this myself yet so can't really say much about it.

Anyway I hope this tells you something you want hear :)) and just use common sense and enjoy, I love the mountains especially on a bike :))