Look for tutorials that mention cross-torqueing and/or pattern-torqueing of all the bolts. I'm sure over ~2 - 3 generations, "they've" probably come up with "like" an "epic", "game-changing" definition for the above, but the end result is still the same.
Those attempting any Passat valve cover gasket R&R job without a torque wrench need not apply.
"valuable cover"? - must have auto-complete turned on...
edit: Looks like the Torque spec is 10Nm for the eight cover nuts
From Shop Manual: Tighten inner cover nuts to 10Nm (Step 1);
Tighten cover perimeter nuts (begin with center upper and lower) diagonally in stages (Step 2)
For tightening in stages, I'd tighten all outers to 5Nm first, then to 10Nm using the same
pattern (middle two, upper left, lower right, lower left, upper right)
It'll seem painstaking if you've never done it, but it beats redoing the job in two months because you didn't follow instructions.