In my experience the fw update is more scary in thought than in deed ! Once you have done a couple of them you don't give them a thought, there is a guide to fw updates written by Shamus McFartfinger, have a read through of it here:
http://forum.imgburn.com/index.php?showtop...entry6175
If you have already d/l the fw update above all you need to do is double click it and run it, you need to make sure that your laptop is connected to the mains power and not switched off until the update is complete.