Test your checklist in real scenarios. By the people who should use them.
Note any issues, and adjust as needed.
Then test the checklist again. Better?
You might find that you need to do this several times, so you're going to need a good tool that will support you.
A good checklist tool should not only let you run through the same checklist many times. It should also be able to let you use a slightly different checklist for that special one-time occasion.
That is what Checksy is designed to do.