Accord Serpentine belt. how much is reasonable?

So as it turns out, it’s not the belt. As 0708Honda and Joe Mayo opined, the problem is the power steering pump. The dealership wants just over $600 to replace it. They say the OEM part costs $400.
I’ve replaced power steering pumps before, but it’s been at least 15 years, maybe twenty.
How hard is this job for someone with basic shade tree mechanic tools and skills?