I think the thing to remember with formatting is that when you do it wrong, you probably won't get complaints, as long as it's simple mistakes like where to start a chapter and where to put in the chapter headings. Life is far to short to spend it trying to convince writers to get such things correct.
You will, however, make people grumble and gripe to those around them because they have to make the changes themselves. I always wonder why these things are even an issue. There must be a million websites that show correct format, and getting chapter headings in the right places, starting a chapter in the right place, spacing, font, etc., are covered by every last one of them. A great many of these sites even have sample manuscript on big display, and a glance tells you what to do.
Go to one of these professional websites,
http://www.sfwriter.com/owindex.htm is one of the best, and do exactly what he tells you to do where format is concerned, no matter what you read or hear elsewhere.
http://www.sfwa.org/writing/ is another excellent site for all things manuscript related. These sites answer pretty much every question there is, and they answer them correctly.
