What are some proper ways to hold the boom? The only ones I know of are holding behind the back and above your shoulders and at the hip. Are there any things you should try to avoid doing? Thanks.
When you say above your shoulders, are you referring to this?
If you have a long enough boom you can hold your arms straight up from your shoulders (its important theyre not at an angle at all) so that you merely balance the boom. The opposite side acts as a counterweight to the microphone side. You're not exerting much energy and you can hold it for extended periods of time. Typically this keeps the boom from cutting into the frame at an angle, so its safely out of frame.