They aren’t too hard to adjust. Its fun to smack it with a hammer! Since I have wooden and iron equivalents, sometimes I get lazy and just change the plane instead of adjusting it! I have 2 extra irons and will eventually make 2 smoothers. I have found that good wooden smoothers with a tight mouth are a bit tricky to find. I have been fortunate that I have a wooden scrub, smoother, jack, jointer, plow, moving fillister, and some moulding planes. I really enjoy them more than metal, but like I said I will never get rid of the no.4