I've done it before. As long as the sound is clean and the video source is free of errors, it just comes down to lining them up and when they go out of sync, make a cut and slide. If there is constant syncing issues, frequently it's because one is running faster than the other, even though it should. In those cases a speed and pitch adjustment is needed. Sampling Hard Boiled, I don't think it will be difficult.

Subtitles will be hard for me because I have always had help. This will be my first time going it alone and I am quite frankly intimidated.

I've no idea where to begin.