Valve lash inspection and adjustment is a great DIY project. Not the best job for a person with no prior engine work experience.Eric the car guy on YouTube did a video of this job on his Element with the k24 engine. Almost makes me want to give it a go down the road.
Access to the valve closet on the 1.8L engine is not difficult and no parts should be needed beyond a couple of dabs of Honda Bond (or equivalent) where specified.
If you have all the necessary tools, the process should not take more than 4 hours. (that's including a beverage break too)