Well I have a mac.. thus I can use voiceover on the mac using iMovie and sync it at the time. People who don't have macs really only have audacity, and all I can say is try to match .. like watch the video and record *has done this many times* But that's to my knowledge. There's many more and nicer stuff you can use for Windows, so you're not exactly out of luck, I just can't help you there. There's a lot of online tutorial things as well. For windows I think you could basically import the audio file into Windows Movie Maker and add a picture if you don't want to match the voice flaps. That's my job for the final project, which I can do on my editor.. but that's information for later.
Yes, kaichou... yes, please please please audition