While I don't have the book, I have read some of Katz articles (thanks Edwin!), and in them he seems to be saying that mastering should only be done by pros. I don't expect to be able to do anywhere near as good as job as someone who knows what they're doing, but I at least want to try and see what I might be able to accomplish. And yes, the available tools can do a lot, if I can learn to use them.
Just looked up the Katz book, and it's on the expensive side. I'm already reading a lot of online material, and I'll see how far that, and experimentation, can take me.
One advantage I have is that there's just the one instrument instead of a full band.