Spark plugs are definitely doable. The compression test is a little more involved. I would read the link about the test that I provided and watch the video. If it is something you feel comfortable with then you can give it a shot.
The main reason for doing all the cylinders are, this gives you a comparison between cylinders because each engine is different and we want to see if one is lower than the others. So if all cylinders are 150 PSI and one is 115 then you have an issue in one but you may find others have an issue as well.
Also, just make sure you disable the ignition so your engine doesn't try to start while performing this test.
Again, if you don't feel comfortable then I would not attempt it on your own the first time. However, if you watch the video and read the guide, and understand what it is doing then go for it. Feel free to post your results if you need help determining if there is an issue.
Wednesday, June 12th, 2019 AT 10:42 AM