Recap:
The old PCV valve is removed from the upper hose after both have been taken out.
The new PCV valve is installed in the upper hose, (with clamp) and is then ready for re-insertion into the lower hose.
The clamp for the intake manifold should be slid back from the end of the hose while you work the upper hose off and on, and then squeezed and replaced in its right position.
The upper hose/PCV assembly can be held and inserted as a unit into the lower hose, which is near-invisible and hard to reach, but not impossible to find and hold.
Make sure you firmly twist the PCV valve into the lower hose. The only thing holding it from coming out again will be the tight fight into the rubber hose.
Here is another glance at nearby hoses which may or may not have to temporarily come off while you work in this area:
