Are the hot/cold and waste pipes in situ?, if not you will need a plumber to plumb them in. If they are, it is a simple job.
Yes, really only the waste pipe that needs connecting correctly. I think a new waste unit that has the waste pipe connector will need to be fitted. As I say, a small job, but annoying one.
Hi Dom, If it already has the feed pipes plumbed in there must at some point have been a waste pipe (assuming the job was completed). If there is a sink u-bend nearby it is possible it used that, if there is a tapered pipe about 4 inches long sticking out of the u-bend that is it. Connect your waste pipe to it but there may be a blind grommet/washer inside the base of it which will have to be removed (easily) otherwise the machine won't drain.