In need of some editing advice

Hello! I am back after 18 days of absence from the world of writing. I haven’t touched my book since but hopefully this means I am now refreshed and ready to see it with new eyes!

I have this week set aside for that, and I made a pledge on a French writing forum I visit, full of amazingly friendly people who really helped me get motivated during the camp NaNo. I set myself some objectives for this month, or rather what’s left of it.

It goes something like this:

In August I will:

1/ Read my novel to see if all the changes I made during the camp NaNo work and do the job they were supposed to.

2/ Write at least 3 articles on my blog.

3/ Edit 3 chapters of the novel.

If I succeed, I will: post a surprise on my blog, don’t know what yet.

If I fail, I will: have a lot of work to do during term-time, which will be bad.

Regarding the editing, I have been wondering how to go about it. Usually I edit in order, then I get stuck in the same first chapters I have edited 1000 times over or lose momentum by the end. Or forget I I’m in ‘editing mode’ and just become a reader. 

This time I’m thinking of doing chapters out of order, to focus on the sentence-level work, since I’ll have checked for flow during my read-through (and it was the whole point of the camp NaNo to start with).

So this is where I need advice. Does this sound like a really bad idea? Writing friends, have you ever tried it? What’s your editing approach?