Well, there are field coding solutions (i.e. no macros required) that should work regardless of document protection. To provide instructions that disappear
• permanently once the document is printed, you could use a field coded as:
{IF{PRINTDATE \@ yyyy}= 0 "Instructions"}
• temporarily when the document is printed, you could use a field coded as:
{IF{PRINTDATE \@ yyyyMMddHHmm}= {DATE \@ yyyyMMddHHmm} "" "Instructions"}
With this second approach, the instructions can be made to re-appear via anything that causes the fields to update (e.g. a print preview or tabbing out of a formfield that has the 'calculate on exit' property set) but you may have to wait for up to a minute after printing to do that.

The alternative is to code the macro to temporarily switch off protection while updating the Style/formatting.

__________________
Cheers,
Paul Edstein
[Fmr MS MVP - Word]