Advice for 67 barracuda floor pans

So this will be my first attemp at swapping out floors. Any tips or tricks I should know before I start. I allready know to wait till I have the replacement floors to start cutting so that I dont cut out to much. I am also open to sugestions as to how weather I should buy the whole pan or both halves or four corners. I was thinking the whole thing for fewer seems but it seems like it could be difficult to work with. I have damage in all four corners but my tunnel is ok. Any help would be appriciated.