What was I thinking?

I'm sitting in the briefing room waiting for my new instructor to get back from a flight, so we can go up together for the first time. When I requested that Belinda assign me a new instructor, it seemed like such a great idea. I'd get my time in, in a timely fashion, and I'd be able to fly my check ride with Belinda. Now, though, I'm trying not to panic. For those who don't know, Mike (the new instructor) will be my 9th flight instructor since I started my training back in Michigan in 2005. I've had some absolutely miserable experiences with some truly God-awful flight instructors, and those bad experiences have left me pretty gun-shy when it comes to flying with someone new. And now, not only am I about to go up with a new instructor, I'm about to do it at 3:15 in the afternoon, when turbulence is near its strongest and I've already had a fully day of mechanic class. This is suddenly seeming like the dumbest thing I could ever do.