What's to "put in?" Unpack the unit, connect a water line if an ice maker is involved (ice maker install "kits" can be had at any Home Depot, Lowe's, etc.), plug in the power cord, set the unit into position, level if necessary. Done.

Don't move it alone. :) Those things are TALL!

Installing fridges is easy. It's the moving them into position without banging up the doorjamb or gouging the floor or dinging the fridge that's the tricky bit.

I have moved lots of large appliances, including refrigerators, by myself. I'm only 5'4" and not burly. It's easier with help, but doable by one person. This is a MUST -- Get a good appliance dolly and a couple of straps. You can rent these at your local box store or appliance store.

let's be careful... if the Liebherr is like the Gag 30", ( I believe they share the casing and hinges) this is a 500 lbs unit that took two movers and a stair walker dolly to move. I could not have moved it myself and I worked at moving appliances as a summer job decades ago so I know the techniques.
Installing the integrated units is a different question and that, if you are careful, can be done yourself. It does take some effort to move back into the cavity and it helps to have two people to guide it into place without damaging the side wall edges.
caspian

Some day, some day in the near [maybe] bright future someone will suggest shopping at a place other than Lowes or HD. Someday....