I've actually found it to be really easy. We have her car seat on the passenger's side, so with the seat extender bars in place, all I do is slide the front seat forward, rest a knee on the floorboard, then set her in her seat. Super easy, and I actually like doing it that way a lot more than putting her in sideways the way you would in a four door vehicle.
Btw, she LOVES riding in the VX. I think the theater seating gives her a lot better view than she gets in the wife's Axiom.