Its no more complicated then putting it in a golf, its actually easier as the power distribution is already in the back.
the only thing that you have to do is use a high quality hi/lo converter that you tap in under the sub which is located in the floor under one of the seats, or if your more daring, and you have the top hifi, you can tap it from the LHS of the boot.
But the Hi input that goes to the sub on the floor starts at the ASK or head unit, and its too much to go to the front.
Battery off so you don't get airbag lights
4 big torx screws, seat out, tap into wire, run wire to the back, put in hi/lo and you have RCA input, and then its straight forward.