Nell, hubby could do with no problem at all. Plug in wiring harness, the only thing is that you need 120 volts to the area, some are pre-wired, some not. You should list the unit you have for us to have more info.
I had a neighbor with a Bobcat loader raise it onto my roof and on a cardboard, I moved it over and mounted it myself.
The vent that is there has to be removed, housing and all, just have the roofing sealer with you and you will be good to go.
Order the bottom cowling as well as just the A/C unit.
Good luck.
Ozz
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