If you are asked to supply AV requirements, be very specific. Specify the resolution of your monitor if you're bringing a laptop so that the AV department will know to supply you with an appropriate projector. Rehearse your presentation at least a couple of times on the same equipment that you will be using to give the presentation. Even if your work runs flawlessly on one computer, it can behave very differently on another machine. Rehearsal with a timing device can also help you ensure that your presentation doesn't take more time than you're allotted for your session.
Moderators love presenters who stick to their allotted time.
If you're using a new training room, make a site visit and check all equipment well in advance of the presentation. Of course, even the best planning can't always prevent disaster. Several years ago, we had an early morning training session that required us to transport a desktop computer and several other pieces of equipment. It was the middle of winter. I half-dressed, grabbed my coat, ran out to walk the dog, then came home, finished packing the car, and drove to the training space.