I think that a lot of the time the student announcers or volunteer try to do too much. They dabble in trying to do color commentary when they aren't even getting the play by play right. Concentrate on getting the names right, and anything that we can't see on the screen...match time, riding time, period, match score, team score, etc. and don't be a homer. Don't try to predict match strategy or interpret referee calls if you aren't sure what's going on. You are just setting yourself up for criticism. If you as an announcer haven't been around the sport for decades, you will probably know less than 90% of the people tuning in, so just stay in your lane and keep it simple.