How do you visually tell to your user that a given link is a bookmarklet so it should not be clicked but just bookmarked?
Is there a proper and recognized icon to use to alert the user that a given link is a bookmarklet?
Maybe you don't have to elaborate too much in the home page. Just don't make the link the bookmarklet itself, but rather let a click on this link open a tiny popup that explains "bookmark this.. blah blah.." and gives the actual link to bookmark.
This also has the added advantage that you can give the first link a descriptive name like "Acme Bookmarklet", which you can't do with the actual bookmarklet link because that's the description the browser is going to give the button.
So, bait and switch, basically.