I have been working a LOT on this lately (I stayed up until Stupid O'Clock in the morning Sunday night fixing all the formatting), but weirdly, I don't mind at all. I'm enjoying it, and find myself putting off other tasks to work on this instead.
Part of it is that I have no emotional investment in the existing text at all. Terrible sentence structure? Not mine! Kill it! Part of it is that there's a lot to fix, and the gratification of doing so is instant. And part of it is that, well, I am good with words, so it's an enjoyable exercise of craft.
It also makes me feel a smidge megalomaniacal to have this very important thing under my complete dominion. Bwa-ha.
The document is bleeding with tracked changes. I love it.