Figure 116 on this page shows the locations of the 1942 flywheel cover screws whilst talking about the clutch. Like most manual pictures, it is a view of the component that makes everything look very simple.
Like Steve_H & Whitelightning recommended, clean the area the best you can & also wear some safety glasses if you're working supine (I was doing the same thing you are four weeks ago).
Go ahead and spray/squirt some penetrant (Blaster/Kroil/Liquid Wrench) in the cylinders through the sparkplug holes if you haven't already.
Good luck!
Brad
