Replacing the floor

well my floor pans need replacing. i got replacement pans in. interior is completely gutted and im ready to start. i was wondering how hard this is goin to be? anyone have any tricks or tips? thanks all!

take out seats carpet and center console.
clean up the floor.
place new pans in the floor.
trace out where the new pans fit
remove floor pan.
cut on the inside of the line you just traced.
drill spotwelds on frame rails
remove the old floorpan
testfit and trim if necisary
buttweld it in.
use a copper backing plate if neccisary jump around to minimise warpage