Simple how-to: Replace Ford Focus rocker (valve) cover gasket, PCV failure #2

Easy DIY how to: replacing the valve/rocker cover gasket on the 2L 16V Zetec engine.
This was caused by a collapsing PCV hose, the replacement of which is the subject of video #1: • Simple how-to: Replace...
You will need:
* Rocker/valve cover gasket, preferably genuine Ford part to match the specific engine
* Sockets (8 mm) and socket wrench, and spanners
* Ideally: torque wrench to set 7 Nm final torque
* Flashlight
* Clean rags, shop towel, microfiber
* Brake clean
* Maybe: screwdriver
* Maybe: small mirror
* Optional: high temperature anti-seize for corrosion-happy external threads and nuts