Check the lighting in the room to make sure it will not be an issue for others in the video conference. Direct light coming through windows in your room can hinder the experience of participants in other sites. If it is a problem, adjust the system of close the window blinds.
Make sure that other participants have a good view of you. If your system has one, use the self-view feature to check that you are squarely in the center of the screen and people are not only seeing the top of your head.
Noisy environments can make it difficult to hear or be heard. If you are unable to eliminate noise, make use of the system's mute button, or use a handset or headset. If you do use either make sure not to yell into them.