You have to remove as much of the interior as possible. Like the side pockets, back seat, front seats, etc. The carpet is usually put down by the manufacture before the top is placed on the hull, so you might have to cut some pieces out since you aren't going to take your top off.
It should be pretty easy. Just be aware that you might not get the carpet in all the same spots it was before because of the top being on the boat. Measure three times, cut once. Take your time putting it in and then replace all the other trim, seats, vinyl etc that you had to take out.