Hi Polly,
I had my scan today. Here's how it went:
Even though I showed up a bit early for my scheduled time, I still had to wait about 45 minutes after my scheduled time before they saw me. The technician was very able and pointed out everything on the screen (head, heart, arms, legs, spine, bladder, kidneys etc etc etc). I did ask to be told the gender, but my baby's legs were closed tight so she could only give me a guess. (both the tech and the doc said they thought it was a girl.) I asked about pictures, and when you sign in at the desk, you should tell them that you want a picture. You will have to fill out a form and each picture costs $290!! My dh didn't want to get one, but I told him I NEEDED one for the scrapbook.

So we did get one. The technician asked the doctor to come in to do the picture to make sure we got a really good one. They also saw something that had them a bit worried, so she had the doctor check that out as well, but it turned out to be nothing, thank goodness.
They will answer any questions you have, just be sure to ask.
good luck with your scan!