I tend to do things the hard way. You'll want to sync the audio first IMO. Which you can do while you generate a proxy to help in edit choices. This should give you relative time stamps for each of the camera angles. A good program probably finds this on it's own. Or I could be wrong, as I've never used one. But I've resolved to scripting most of my stuff in bash, which takes a while to process and requires a little manual effort to train it. On the plus side, it also allows a redo of the entire process, verbatim, if I happen to discover a better way in terms of results, not efficiency. Or if I'm just bored and want to see what it looks like through the gimps predator plugin. Being a weekend warrior helps to have the time/resources to travel the long road. Since it's a hobby, not a paid gig.