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To be fair, I think you need to go to a little bit more updated mechanic. Car manufacturers can’t lock the diagnostic system so only they can do it, because it’s not legal! Sure it’s more difficult on newer cars, but it’s not impossible so if you want to use an independent mechanic I would just use someone that is updated on newer car models.
I think you should call an authorized Honda dealer and they will give the accurate part numbers you need for the bulletin repair! There’re a lot of sketchy websites online also, so if you are not 100% sure it’s legit parts it may be worth the money to just buy it from your local authorized dealer!
When changing the spark plugs, you need to remove the ignition coils or wires and sometimes they can get damaged if they are old, even if you do nothing wrong. A faulty ignition coil could therefore cause the misfires on cylinder one.
If you drive too far with misfires, it can result in either a false P0420 code or the misfires can even damage the catalytic converter. I would try to fix the misfires first, then clear the codes and drive for a while