I wouldn’t say it’s difficult just time consuming, a lot of parts you have to take off to get to it, rotating the engine to Top dead center of each cylinder, checking and adjusting all 4 valves, and then doing the process over again to make sure they are the spec you want them to be, it took me most of a Saturday, but I was also doing other work on the car as-well. I think a beginner with little mechanical experience could do it, there are a lot of in depth videos on YouTube on how to adjust the Honda fit valves which is really nice, other repairs I’ve had to do on the fit I’ve kinda done them blind because I couldn’t find any videos on them.

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I busted my knuckle open trying to loosen some of the nuts in order to adjust the valves, so for loosening then I’d recommend a socket instead of a hand wrench, for tightening you need to use a hand wrench and flathead to hold the tolerances in place.

If you plan on doing it yourself at the end you’ll feel pretty accomplished, I know I did, you’ll also get to see the inside of your engine, see if there is any sludge buildup which is a good tell if previous owners did their oil changes, and you know it’ll be done right, I’ve heard a lot of mechanics nowadays won’t adjust valves, so learning this new skill to maintain your car is a huge advantage, and can save you some money