Place your middle finger on the 2nd fret (D string) and then roll it down so that it covers the 2nd frets (G and B strings). When doing this, you'll have to push down on the tip of your finger while also lifting the back end (so you don't touch the hi E string. This is tough to get use to here, but can help with more complex chords later on.
(and of course your fingers aren't too fat... just look at Yngwie). :D
