If you can change the pads you can change the calipers because you essentially have everything disconnected but the brake line. You're gonna want to bleed the system though. autozone.com has pretty good basic instructions for changing calipers in their vehicle repair guide and is vehicle specific with pics. Go there, it's a life saver
http://autozone.com/servlet/UiBroker...3d800d1c1f.jsp
don't know if this link will work to direct you to the page or not. This is the one for my car...go to the main page and find the car your looking for and you'll figure it out