Dishwasher is harder than it looks.
I recommend buying from Sears and paying their install fee. You are clearly past that though.
The not coming with a hose bit is common. Make sure you get a steel wrapped hose.
Also, it's really important that it be in there with the proper leveling or it won't drain properly.
Best tip I got when I did mine, "built in" style dishwashers come with plastic wheels on the back to make it easy to roll.
Take those off. They aren't supposed to be on when it's installed. I'd never have figured that out on my own, and getting it level was impossible with those on since it was too tall in the back.