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No worries - just shout if you need a hand with it. It'll take 2 seconds to type the css if you fancy pasting the code.

You'll probably also need to clear the next element on the page (add...

You can still do it using the list properties provided that either the <ul> or parent <div> has a class you can apply styles to. Or alteratively you could add a div to the outside of the shortcode.
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According to w3schools, IE doesn't support it: CSS3 column-count property

You said this is for a list though, right? Why not just add float and width parameters to the <li> tag? Unless I'm missing...