Took me 3-4 hours to have mine out everything cleaned up and ready for a new one it is probably a 1 day job total and I am not a body person.
No need to drill every spot weld, cut floor about 1 inch from the edge and use a curved bit on a air hammer to roll old metal off the spot weld then use flap disk sanding pad to remove rest of metal. Only had to drill spot welds on frame rails and where it attaches to front toe section in a couple spots.
I have a coupe so there was no need to remove all of the braces underneath the car, but a buddy of mine did his vert and used the same methods.
Just finished mine recently