[Scuba Steve]

I DIY'd so I'm making this up based on the funner parts of the install. Also assuming you know how to evaluate the different products so no questions about that.

- How flat do they get the floor down to? (+/- X in per 8 foot radius is the type of answer they'll give). Important in order to prevent highs/lows/squeaking. They'll grind high spots and/or fill low ones with self-leveling compound. Acceptable +/- values and radius will be given by the manufacturer in their instructions.

- How do they test for slab moisture? I've seen meters, but 2'x2' squares of plastic taped to the slab in various places can also tell. Pull 'em up after a couple of days and if the concrete is a different color underneath or you see condensation, you've got problems.

- What kind of glue do they use? Important b/c if you have warranty issues the manufacturer will ask. Wrong kind of glue or unapproved installer = no warranty.

- If you're not a fan of quarter round or shoe molding, figure that stuff out now. We decided to remove / repaint / reinstall the baseboards so that they sat on top of the wood rather than leave them in (would've been too low) and cover the gap with quarter round. It came out looking much cleaner that way IMO. In any case it's a perfect opportunity to clean up and refresh your baseboards.

One more thing. If at all possible, do all your moisture and demo work when it's raining. If it's not raining, spray the crap out of the side of the house with a garden hose up to the second floor. I found three leaks that way - stuff you wouldn't have noticed for 50 years with the carpet in there, but that was obvious when raining and would've ruined the wood in the area if not corrected. One was a hairline crack in the mortar between two bricks in a windowsill upstairs (leaking down to the 1st floor). The second at the bottom of the first row of brick around the patio (built in part of the slab / exposed aggregate. Should've sealed below the 1st row of brick instead of mortaring it). The third was some failed flashing on the chimney. House is only 18 years old and well built, but the problems were invisible before the carpet was removed.