Did mine last week. Been in a 152 (compared to a 172 that im used to) made things a little easier - things happen a lot slower!
The examiner expects you to be nervous so dont be worried that they will pick you up on it. My examiner did the circuits first, then NAV, and then general handeling.
As long as you keep your checks going and are safe then you will be fine. If you are not been safe the examiner should stop you, and if there is only minor points then they will tell you at the end.
Just treat it as another lesson, just flying with a different instructor for the first time so you want to try and impress them. And always just check that they are happy as if theyre a passenger. If you dont know your examiner get them talking during NAV if your not doing much (with a 30 knot headwind i had time to burn).
Just dont worry about it, just make sure you are safe and you will be fine!