Hey 99,
Once you get the right tools and get your mind around how the adjustment works it's not that hard.
I would suggest checking the clearances and pulling/measuring/replacing the shims on the valves that are out of spec. Put the valve cover back on and keep driving it. Then you can order the order the new shims you need and tear it back apart once you get the replacement parts. It may add 2 hours to the project but you won't have vehicle downtime.
This tool works quite well:
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
My only gripe was that the little end of the holder tool was not quite long enough to keep the bucket depressed far enough. I squashed the end in a bench vise and it grew 0.030", then it worked perfect