Do you have interview / directoral responsibility as well.
If so I think youre spreaading yourself thin.
directing, interviewing, lighting, sound (which youre afraid of) camera , edit graphics etc etc.
id serously consider hiring a sound man or an assistant with sound experience
this forum is littered with posts from people who arent soundies coming unstuck and regretting it. Not enough experience, ability, equipment and knowlege combined with too much brainpower elsewhere (down the lens, thinking about content, cutting, coverage etc etc. spells potential disatser.
If you must do it all yourself, practice your sound technique in advance so you are 100% relaxed about your ability – let the pictures look after themselves. Theyll probable fare better than the sound!!
Peter
Post Production Dubbing Mixer