I always do some end-to-end tests. From recording to capture and edit, sometimes all the way to DVD and watching the final DVD on my TV. I experiment with all the manual controls, record audio in a quiet room to check out the noise level from the camera (if using on-camera mic) and pre-amp. If you're using an external microphone, be sure to check that out, check gain and noise levels, etc. If you are using the on-camera mic, be sure to zoom in and out while recording a quiet room, to see how loud the zoom motor will be in the recording.
Turn off all of the automatic settings on the camera, figure out how to set and lock the white balance, how to set the iris and shutter speed if you can, and get a feel for focusing the camera. If the manual focus is a bear, you may as well find that out now and do what you can to work with it, or find out how to use the autofocus to set the focus and turn it off so the focus doesn't change when you don't want it to.
Record all of your tests, capture them on the computer, use headphones to listen to the audio so you don't miss anything, make sure your captured video doesn't have dropped frames or out of sync audio, etc.
Test everything before you invest your time and other people's time in any kind of production. Never assume something will work until you've tested it.
Doug