Roundabouts are something I found very hard- just remember that it all gets easier after you’ve finished learning! A hesitation is just something which could cause confusion to the person behind you. If you think it is safe to go- definitely go for it. But if you’re not sure it’s safe, make sure you’re vocal and tell the examiner that you believed it wasn’t safe.
Something I struggled with is seeing where someone was going and worrying they’d not turn where I thought they would- that’s definitely a confidence thing. Personally, once I’d passed my test I found it all so much easier- maybe it was just nerves of someone watching my every move lessons, haha! You’ll get there- I passed on my third attempt. It’s really difficult and depends solely on the day, and centres have pass rates too.So don’t get down hearted if the day doesn’t go the way you wanted.
Good luck, I’m sure you’ll do awesome!