It's real easy, we can walk you through it too. Maybe join us in the chat room if you have issues. This would also be a good time to make sure you have your player upto version 2.00 final "developer" (not a beta) since you will have your serial cable out.
Besides the visual mode, the HiJack kernal allows you to do many other cool things. There are too many to list, but it will give you Bass and Treble controls, an automatic volume adjustment (to make all songs the same volume) and a cool "Breakout" game.
All of this in one kernal. Once you get more comfortable, you will discover tons of other features of HiJack.
On thing to keep in mind, you can't break your empeg sending a kernal to it. It's very safe.