I've learned revision through many years of revising novels, but the best method I've learned has been Holly Lisle's How To Revise Your Novel course. Ms. Lisle worked as an emergency room nurse for many years, and this general approach to revision can be likened to taking care of a patient in the E.R. When the patient first arrives, you don't start just randomly doing surgery on him. First you have to figure out what's wrong (and also what isn't wrong, so you don't end up removing a perfectly good spleen or something), then you make a plan for fixing it, then you take him into surgery and start cutting. Likewise, in this approach, you don't just start crossing stuff out in your manuscript right away; first you figure out what's wrong with it (and what's right), then you make your revision plan, THEN you get out the red pen and start making your corrections.
So, here's an overview of what goes into bringing you another fine Kyra Halland fantasy novel :D
1. I write a novel. This is a whole different process, and one I'll talk about more another time.
2. When the first draft of the novel is finished, I print it out on three-hole-punched paper and put it in a binder. This revision method will not work if you're working from a computer screen. Here's the printout of all six books of Daughter of the Wildings. My husband saw this and said, "That's a big binder." Of course, what he meant was, "Wow, I'm really impressed that you wrote something that long!" (This picture was taken right after I started the analysis or triage stage of the revision; I'm now about 2/3 through that stage.)
4. Once I've gone all the way through the manuscript and made my notes, I get out a bunch of index cards (index cards are key to this method, and I've developed something of a fetish for them :D). I make an index card for each scene as I want that scene to be (not as it is now), giving a one-sentence summary of the scene and what the scene is supposed to accomplish, story-wise. Then, referring to my sheaves of notes, I write a summary on the back of each card of the changes I want to make in each scene. Finally, I color-code each card with a post-it, showing approximately how much work each scene is going to need. Neon green means I'll be changing up to about 25% of the scene, bright yellow means 25-50%, neon orange is 50-75%, hot pink is 75-100% or a completely new scene. (I love post-its. Along with 3-hole-punched printer paper, Tul pens, and index cards, they're one of my essential non-computer writing tools.)
Here's a marked-up page; if you look closely, you can see where I circled something in blue that I had crossed out and then decided to keep. I make use of top, bottom, and side margins, and the arrows pointing off the side show where the new writing spills over onto the back.
6. Strictly speaking, you're supposed to wait until you've marked up the whole manuscript before you start typing in the corrections, but I'm afraid I'll forget what half of my arrows and cryptic scribbles mean, so I type up each day's revision when I'm finished.
Update: while we're on the medical theme, I'm happy to report that after a lot of tests (including a stress test which I rocked, working out hard with absolutely no symptoms), I had an appointment with a cardiologist today and got good news (or, at least, better news than I was afraid it would be). I have a small to moderate amount of fluid around my heart (pericardial effusion), which apparently has been there for a while. It isn't causing any serious problems, except for some occasional discomfort. We're going to keep an eye on it to see what it does, if it gets worse or stays the same or goes away. In the meantime, the doctor suspects that it was caused by inflammation/autoimmune activity (which would also be consistent with my chronic fatigue syndrome) and so the next step is to see a rheumatologist. Hopefully we can pin down the underlying cause and treat it, which will control or eliminate the pericardial effusion.
***If you're a writer, I highly recommend the How To Revise Your Novel course. It's a brain-wrenching, gut-wrenching five months and costs about $250, but if you want to publish your writing, it's the best 5 months and $250 you can spend. The link is my affiliate link; I get a commission when someone buys the course through that link. But I don't promote the course because I'm an affiliate; I promote it because taking it has been the best thing I've ever done for my writing. Regular link if you want to find out about the course without following my affiliate link.