I have never had a portable dishwasher, but I have installed an under the counter. If you have a disposal it is fairly easy. The disposal has a plug on the side that you remove and attach a flexible drainline (ask at the hardware store) the drainline clamps onto the side of the disposal and connects to the drain on the diswasher. Next you need to purchase a tee fitting for the hot water line and a flexible water line. Look under you sink, most newer sinks have a flexible hose to the water valve. you will need to install the tee fitting and split the water to the water valve on the sink and the other will go to the dishwasher. You will also need to install an electrical outlet somewere near the dishwasher. If you do not know about electricity do not do this part.