Real Gasket Push Rod Tube Installation

Has anybody within the group ever "upgraded" their existing push rod tubes to the Real Gasket example?  I have developed an oil leak coming from the tube at the no. 2 cylinder.  Has gotten worse over the course of flying more.  Anyway, I had a mechanic take a look (was use to the simplification of continental installs for Cessna 150's).  He saw all the baffling and was curious if the removal of the existing tube could be done without removing the baffle.  Yes, everything else (prop, nose bowl, etc.) has to be removed in order to pull the valve cover to take out the existing push rod prior to cutting out the old...For some reason, he feels that I can perform the majority of the work...not!  Working on an engine makes me a bit skiddish.  Oil change?, no problem.  Any comment or recommendations is greatly appreciated.  I will get my regular Ercoupe A&P to the work with my assistance.
Thanks.