That sounds a pretty "standard" way of doing it to me
Syncing is a doddle. At the beginning of each take simply name the take - eg "C Am F G7 progression 3 take 2" (it's surprising how important this is) then "3 - 2 -1" and snap your fingers or make some other quick loud percussive sound.
When you have the Video/Audio and guitar audio on the timeline, you should see a sharp brief peak on both audio tracks where the "click" is. Turn OFF quantise and move the GUITAR track to allign the two.
Job done.