@Sam Ayres
You can use the page properties macro.
1) Add the Page Properties Macro.
2) Add notes or instructions within the macro box.
3) Check the "Hidden" box within the macro.
The content within the macro will not show unless you are in Edit mode (as long as the Hidden box is checked).
There's another trick to this if you want to do it without add-ons.
Create a new template, and look carefully for the formatting for guidance or placeholder text. Create some text and make it that type.
Create a new page from the template, so you end up in edit mode.
Highlight and copy some of the placeholder text.
Paste it into the edit page for the page you want it on and then update the text to what you need there.
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