"Pilots who wish to conduct instrument approaches should be particularly
alert for other aircraft in the pattern so as to avoid interrupting the
flow of traffic. Position reports on the CTAF should include distance
and direction from the airport, as well as the pilot's intentions upon
completion of the approach."

From section 7 of:http://rgl.faa.gov/Regulatory_and_Gu...visoryCircular...

Well.

I think it boils down to this: a pilot should not depend on other
pilots going beyond what is required of them to be in the air.

A student pilot does not need to know anything about IFR operations to
be in the air. Can you count on him knowing what IFR announcements on
the radio mean? No.

A private pilot does not need to know anything about IFR operations to
be in the air. Can't count on him either.

I appreciate that it's a good idea to learn about IFR, and I am.
However, in my spare time studies of this I haven't read yet about
approach procedures or the radio announcements that describe it. I
wouldn't advise anyone with an IFR rating counting on me understanding
such communications.

The FAA doesn't advise that either.