8-in-12 is NOT okay to walk on (without a safety net). A 6 pitch is
even worse, because you don't think you even need a safety net. The DE
goes on first. Only tacked in a few places. Let it play straight. Then
the starter course is laid on top of the DE. Place your fasteners
through the starter course and into the DE. If you've already laid your
starter course and can still fit the DE under, good. The instructions
are on every bundle, by the way. Tom