For anyone experienced with installing intercom systems.....?

We would like the M&S DC1 CD Changer...I enjoy do it yourself projects. My home has never had an intercom system in it and I was wondering how difficult this would be for me to do. This system has a master (I would install it in my kitchen), 7 substations, a patio and front door stations. Mind you, I know basic wiring skills, fishing through walls, cutting sheet rock etc. And advice? Thanks.