Before you start the installation process, make sure to have the exact measurements of all the appliances, keeping in mind such things as door and hinge clearance needed in cabinet openings. This will make things go a lot smoother when it comes time to slide them in.
You may have to pick up a dishwasher supply line at the hardware store. Make sure it's long enough to reach under the sink.
Push the lines through the holes for the plumber to hook up.
Hook up the electrical connection or have an electrician do it.
Put the lower cover plate back on, and slide the dishwasher into place.