Well, I live more than 20 miles away and I put down a Pergo floor in my
kitchen, so I guess that makes me an expert!
Under Pergo, you will need to put a "felt" underlayment. There were
two types, when I put my floor down. One was quite thin (and cheap)
and the other was quite thick (and more expensive). I opted for the
expensive one. I didn't do any leveling. I laid the Pergo over those
old vinyl type tiles that were used in may commercial buildings in the
AS long as you use the underlayment fabric, I don't think you'll need
to do any leveling, unless it has some REAL dips and bumps.