It's always important to provide illustrations in your user and training materials. Make sure that the screenshots look professional.

Don't use real customer data in your examples. You have an obligation to protect confidential or sensitive data. (If you haven't looked at yours lately, you may want to look through them.)

If you use technology or a graphics package to obfuscate or cover sensitive information, make sure that someone can't take the layers apart to access the data.

Make sure that your screenshots match the step that you're defining. Make sure all field names and titles match.