My turn to do valve seals

[Toothbrush]

When you try to remove the valve covers, just a tip that worked for me (on install, my experience with removal was before this method )...

No brute force or fighting is necessary if you angle them just right.

1. Once you have them free (e.g. spark plug tubes clear, unbolted) and ready to lift off
2. Turn the front of one cover up and towards the other side of the engine so that the top-back corner is the only thing you need to clear the eccentric sensor
3. While looking/feeling along the top-back corner, gently slide the cover over the eccentric sensor

if you have a second pair of eyes, it's much easier of course.

If you do it right, it will slide right over the top of those sensor ears (that everyone breaks) without too much trouble, strain, stress or words you wouldn't normally say in mixed company. It also may take some time to figure out the correct angle, but it can be done.