I did it in my old truck. Its very easy if your handy, and on my seats I didn't lose the armrest because it mounted to the side of the seat.
Remove the seat, only 4 bolts hold it 2 the floor. I cut out all the foam of the middle seat and there is a metal frame inside of it all, cut that off with a 5" grinder. Then i carefully cut the rest of the foam to follow the contours of the seat side. once I did that folded the extra material down, figured out where the front right side seat had to be re-sown, pulled the fabric off the seat, hand sewed it, pulled it back over, cut off the excess, and bolted it all back in. It's not to hard, takes some time and skill.