Somewhere on this thread I posted my "way to cut" list. I'll have to look for it. (It also works in reverse for padding
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I found I often made a point more than once, used unnecessary dialogue tags, or started out dialogue with "oh," "okay," "well," etc. when I didn't need to.
Another thing to watch for is overdescribing actions. He shrugged his shoulders. (What else would he shrug?) She walked out the door. (As opposed to the window?) They nodded their heads. (Easier than nodding their elbows.)
The 13,000 word cut job was hard and took a long time. I found that using the "find" function helped me see some things that I otherwise wouldn't. All those -ly words, for one. From legal writing, I had a habit of always using "that" even where it's optional and never, ever using contractions. Those two changes saved me quite a bit.
I concur with the looking at sentences beginning with "there." You can often cut by rewriting, and the sentences end up better, too. Same thing with "it" or use of the passive voice.
One pet flaw of mine is to use progressive tenses when simple ones will do (and I save a word).
There are phrases, too, that often can be cut. Everyone probably has their own offenders. To take one example, "at this time" or "right now" instead of "now." And sometimes it's obvious when you're talking about and you don't even need the "now."
Heck, I should find that list of mine. But first, my task is to work on my synopsis. Maybe someone else happens to remember the post number where I put my list. Or if I'm misremembering and only thought about posting it...
One trick before I go. I use em dashes a lot. Switching from "[space] dash dash [space]" to an actual em dash without spaces saves two words a pop, as far as Word is concerned.