There are detailed videos on YouTube if you are a visual person like myself.
You can also use the search function to find several write up's on this forum and others that will be useful.
http://tech.240sxone.com/115/ka24de-egr-removal/
They do make egr delete plates to entirely block off the valve. Here is an example:
https://frsport.com/circuit-sports-e...SABEgIiTfD_BwE
Best of luck, very cool that you are the original owner