Most new dishwashers follow the same installation process. The easiest ones to install fit the dimensions of the space that they need to occupy. Dishwashers are designed with the same three connections: an electrical hookup, a water supply and a drain line.
When installing a new dishwasher or replacing an old one, turn off the power at the circuit breaker panel, and shutoff the water supply to the sink. If installing a new dishwasher, the first steps are to install the three required connections. Dishwashers that have an AC adapter are easier to install than ones that need to be hardwired.
If replacing an old dishwasher, remove the front panel on the bottom of the machine, and disconnect the electrical cable, water supply and drain lines. Undo the mounting screws on the top or side of the dishwasher, and slide it out, away from the wall.
When replacing a dishwasher, the new one is connected in the same manner as the old one was removed. It is best to use new flexible copper or steel tubing for the water supply line. When installing a brand new machine, holes need to be drilled for the water supply and drains between the sink to the dishwasher, and an electrical outlet or junction box also needs to be present, and installed, if needed.