Second on the Final cut pro, my wife uses a mac, edit's high def all the time like nothing. In Imovie its like 3 clicks and you video is published to youtube.
Your software might not be set up to handle high def, in that case you can lower the quality of the camera to to regular HV...get the book out.
Like above if it outputs in mov, and you don't have the codecs to deal with it, then you'll have to convert it first.