I passed a couple of years ago, did my CBT, passed all the theory stuff and cracked on with the bigger bike lessons.
I used to get quite nervous before lessons (must be an age thing as I don't usually get nervous). Made it hard to look forward to lessons. I changed the times I was taking them to make sure I was not having to hurry to make them and this helped a lot.
Don't overthink things either, I was doing the slow speed manoeuvres no problem at the practice ground then on test day I had a good total brain fart and asked the examiner if I could have a minute to compose myself. He said no problem as I had nearly dabbed a foot during the slalom. I was just glad to get that bit done.
Then on the road ride part the bloody bike broke down so that was the end of the test. Had to wait 2 weeks to get another date. Got a free lesson and free re-sit though so not all bad. Passed on a Saturday morning at 9am, no minors either so well chuffed. He asked why I didn't accelerate up to 70mph on a short bit of dual carriageway, my reply was "because I was bloody freezing". He just laughed.
Got home, grabbed the rest of my gear and went to pick up my new bike.. 1997 Suzuki TL1000s in red. Not a great 1st bike but I love it, and as already mentioned, it will only go as fast as I let it.
No real insight there just my story..
Enjoy the bike shopping and lessons.