Dear Miss Snark, (well at least it wasn't Greetings! or Hail Felon Well Met!)
(lots of stuff about the book)
(more stuff about the credentials)
You'll find I'm easy to work with and open to editing.
Whoa Nellie, Katie bar the door and Halto Bat Segundo!
I don't know if you've ever noticed this but it's my experience that people who feel the need to tell you what they are like (easy to work with; honest; chaste) are by and large the very ones who ain't.
My clients who ARE easy to work with and open to editing don't even think to mention it -- I don't think it occured to them that they wouldn't be.
Almost to the last one, every person who has said "I'm very easy to work with" has been a total PITA.
Do yourself a favor. Act like being easy to work with and open to editing is such a basic fact you don't even need to mention it.