Also,
Never take your eyes off your plane, if you need to look at the radio for any reason hold it up so you can see both your radio and plane (better to get help from another flyer if possible)
IF you lose your airplane in the sun (happens kind of easy at my field as we face south) keep your sticks neutral until you can see it again. If others are at the field yell out I can't see my plane and perhaps they can talk you through.