Just to let you in on my experiences, the last time i installed one i was having a bad day. I used a socket as previously described with the bolt running up the centre of the socket to help keep the star nut square as it went in, but where i went wrong, i knocked the star nut in too deep and the bolt wasn't long enough to reach it. Then i thought i could knock it all the way through and out the bottom of the steerer but of course the steerer is butted and it wouldn't go all the way through.

I had to go get another star nut and the first one is still down in there, sometimes i'm such a dummass.