Perhaps I misread but I thought he knew where the righting line was, he was just having trouble reaching over the top hull to grab it while standing on the bottom hull.
The righting line works best when it is pulled from the deck side over the top hull. I suppose you could try to use it from the underside but in watching my wife try to do this, the result was that the line was too long for an easy grip and your leverage would be weaker.
My concept was assuming that he was having trouble reaching over the top hull to get at the righting line. I really don't think this should be a problem at all once you are in a standing position but I didn't want to make any assumptions about his arm length or comfort in standing/balancing in this position so thus I suggested a 2nd line that could be tied off at the very bow of the boat where it could be reached before even climbing up on the bottom hull.
I don't know of a video and this morning was the first day I saw ice along the edges of my bay so I'm not making one
, but if you have the assembly manual for your bravo, there are some good photos of the process on page 14. If you do not have a copy, it can be downloaded or viewed here.http://static.hobiecat.com/digital_assets/BravoManual.pdf