as others have posted, this is not hard to do. if it is a quiet show, you will need shockmounts and/or a foam handgrip for the t-bar as the quiet segments of the show will really make any handling noise very clear. if the show has high spl's you won't hear the handling noise but it will still be there. i used to have a really nice foam handgrip made by location sound corp. in l.a. it had a 5/8-27 female thread on it and was perfect. it is also important to hold the mics as high as you can to eliminate any comb filtering or phasing from people moving their heads around you. when i taped gd shows handheld i would hold the pair on a tbar just below my eyes or in front of my forehead. this will also prevent any exhalations from your nostrils becoming an annoying rumble on the recording. you also should try to hold the mics as motionless as possible, the monopod or stand is a good plan, as is a helper. the best stealth tapes are always a 2 person operation, although it is very do-able by yourself. just remember to have your dummy tape and don't be holding anything that would get you into real trouble if the police get involved. best of luck and try not to look like you are up to no good.
coop