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Use band clamps/hose clamps on the waste to stop it from falling out and causing a big leak. Not sure if its a requirement but see it too often.
Read instructions on how to level it, often feet at teh front are by hand or with a spanner, but at the back is via a socket/wrench/allen key in a hole kind of a situation. Had some fitter break ours when they moved machine out of way for another purpose and just ripped the leg adjustment mechanism out of it.
How hard is installing your own dishwasher on a scale of 1 to 10?
And what's the hardest part?