The first step is to find out which microformats you want to use.
After that you should create your personal microformat which fits into your layout.
Make that a text form template and fill it by hand. More advanced would be to fill it through database variables (i.e. for lists of hCards or hReviews).
Then copy the source code into your article.

That’s definitely a way to have ‘well formed’ and ‘well designed’ microformats for your site.

If you plan only to publish a single microformat as a single article then you should design an article form/template which will create a microformat article from your article input fields. Problem here is that it is not easy to do bulk changes if you are not database savvy with your solution.

All plugins I have seen so far don’t give you the freedom of design which you definitely want to have.

Plug-in homepage and documentation: Textpattern Microformats Plugin [pnh_mf]

Textpattern forum thread: plugin:pnh_mf – microformat tags plugin

I will install and test it in a minute …