I have this little How-To:

http://www.angelfire.com/biz7/aiperf...djustment.html

how difficult would it be for me to do this on my own having never lifted off that valve cover and doing so myself. I'm not a dumbass or anything. I just don't want to mess anything up, and dunno how easy it is to mess with something while doing this.

 

It's not hard at all. I was the one who wrote that how-to so you could ask me any questions if they come up.