Once your interior mating surfaces are prepared, you will need to preliminarily shape your floorpan and set it into place as a test fit. Note, this will usually always involve cutting and shaping your floorpan! I place my floorpan beneath the car, held up by a hydraulic jack and bolted into place with three bolts. From there, I go inside the car and trace the shape of the lip with a nail, etching the paint. Remove the floorpan from beneath the car and using an angle grinder with a cutting wheel, trim excess metal from the pan, remembering to leave a bit to overlap the interior lip you created when cutting out the old pan. Because the inside of the floorpan rests OVER a lip and the outside bolts up UNDER the car, you'll have a bit of challenge with the over/under transition. Just carefully cut metal as close as possible to make it slip up in there. You're going to have to take it back out again, so don't get too gung-ho about attaching it too securely at this point.
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