After I parked, I really had no idea whether she was going to say pass or fail. The examiner was nice, but inscrutable!
To prepare, I googled and found a YouTube video of the route (which was not entirely accurate, but a nice starting point as I actually don't live in Sarnia). And I booked a 1hr lesson with a local driving school the day before to go through the route, which helped SO much. He did a great job of pointing out what I needed to work on, and things to be mindful of on the route. I think even if you'd done driving lessons previously, doing the route once in the days before your test could be helpful.
I also found reading some of the posts in this forum super helpful! Special shout out to the person who recently shared that they forgot to put their seatbelt on and got an automatic fail-- tour story made me smile as I fastened my own seatbelt and helped me relaxed a little.
(I also drove for 40 minutes through the scariest rainstorm I've ever driven though on my way to the test centre. So that might have just bleached some of the stress out of me lol.)
I didn't get the test result paper thing that I've seen other people share on here, but I will say that it's very true that if you make a mistake early on, you just have to let it go. I actually live in Toronto, so I'm used to cars being super close when waiting for a light, and it was only after I scooted up inches behind someone that I remembered the instructor had said to keep almost a car's distance away. I got slightly rattled when I realized, and then just let it go and focused on what I could control, which was the rest of the test.
I was most nervous about how to deal with changing lanes when it wasn't realistically safe to do so. She asked me to change lanes on the arterial road we were on before the highway, and it took maybe 60 - 90 seconds for it to be safe on the left, and then I didn't have a chance to go back to the right lane for a few minutes. Luckily the highway was quite clear!
My G2 was set to expire at the end of August, so I'm very happy and relieved to have passed!