Eprom is fairly easy to install.
Here is what I did:
Unplug the unit.
BE CAREFUL on this next step> the top has the fan on it and the wires go to the board. You don't want to fling the top off and yank the wires out or yank on the board. So..... Unscrew the top and Gently move it to the side taking care not to yank the fan wires.
Ground youself to the chassis (I just keep my hand on it).
One way to get eprom out is if you have an eprom puller tool (I dont have one). I used a small pointed craft tool to gently pry up around the corners of the old chip up to get it out of the board socket. You could use a skinny nail, thick needle, or similar pointed object and get similar results.
The eproms dont have prongs like in the old days so there is nothing that can get bent. Fractal mails it in a regular envelope.
After getting the old one out, make sure the new one is oriented correctly and gently press it in until it is seated.. you may need to be slightly firm with it to fully seat it. You can tell it is oriented correctly because it has a small tab, or you can just pay attention to how the old one was oriented and take note to put new one in same way.
Reassemble.. AGAIN watch out not to yank the wires when moving the top!
Power on and enjoy.