No. of Recommendations: 1
Just for the record, installing a dishwasher typically involves two hoses and an electrical connection. Period. Except for wrestling the old one out and the new one in, it should take 30-60 minutes, tops, unless you happen to find yourself with an odd connector and need to run to the hardware store.

The electrical connection is usually two wire nuts and a ground screwed to the chassis, the two hoses are usually a couple of ring clamps which unscrew and pull apart, or possibly a compression fitting which just tightens on with a wrench.

Since the last guy "walked" the old one into place, you can be sure you can walk it back out without too much trouble (unless you have added a new tile floor and "trapped" it in). If it's really snug you can lower it by turning the "feet" which add or subract height by tirning.

Look for two screws holding the dishwasher to the underside of the counter, and possibly, tho not usually one on each side of the chassis into the cabinet frame. The vanity "kick plate" at the bottom of the dishwasher comes off with two screws, also.

Walk it out. Disconnect electric, disconnect hoses, move new one into semi-position, connect hoses, connect electric, push in place, done. The only trick is to plan where the hoses will be as you push it back in. You don't want to kink the hoses, obviously. It's best form to replace the water-in (exhaust line isn't under pressure, rarely needs changing) line, which is under constant pressure, but if you just had one put in 4 years ago it's most probably unnecessary.

Extra credit: add soundproofing layer as you push it back in. They will sell you a 'jacket' of insulation for about $50, but just wrapping it in some leftover Fiberglas insulation will do mostly the same thing. You can knock the sound in half with only another few minutes effort. One thing: there's probably a small air vent somewhere in the back which discourages mildew; don't block it if you choose to add insulation.

This is a job so far below the level of 'master plumber' it isn't funny. Maybe it's not for a beginner because it seems intimidating, but there's nothing that a beginner can't do.
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