Don’t be.
I’ve described using smaller fonts in a previous recent post: Any Stockpickers out there? - #685 by Your_Full_Name
For the superposition of text, just add <sup>the superpositioned text</sup> and the rendered text will appear as the superpositioned text. If you manually type this in the editor text box, your typing of ‘<sup>’ will disappear into nothingness displayed on the right pane, so you’ll have to so-called escape ("save*) some characters from being interpreted, and to have ‘<sup>’ being interpreted correctly, you’ll type “backslash” (‘\’), “less than” (‘<’), the string “sup” >.
Good luck?
Edit: Corrected the escape character stuff, it’s not necessary.