We might have different concepts of "hard", but if I were a construction worker I think I would agree. Hell, I'm a developer and I agree. Figuring out what to do definitely is the hard part. The rest is work and can be sweaty, but it's not hard as if it's full of impenetrable math or requiring undiscovered physics. It's just time-consuming and in the case of construction work physically tiring.

It might be that I have been doing this for too long and no longer see it.