I'm with others... do what you can but be sure to document, document and document what you did and didn't do.

If/when I do go through I agree with the poster about the kicking the insulation before stepping. I'm always looking for that bare wood rafter/truss-cord top. It's amazing how often you clear some insulation and are right on top of a mechanical line of some type.

Particularly with all the new flexible lines (gas, plumbing, etc) it's easy to squish or break something.