When I set to revise my first novel, A Mage's Power, I resolved that I would do my own editing. I didn't want to pay hundreds of dollars for someone to do something that I could do myself. It made me feel lazy. Also, I didn't want to wait for them to get to and then finish my manuscript. Finally, I notice story elements that can be improved when I edit myself which is something an editor would not notice because they lack my background on the story. (See my post on "Useful Problems" for more information). As I do a third "Absolutely the Last Revision" I'm considering changing my policy for the sequel.
Time and again I am amazed by the errors I can miss. Double Double words; words in places the wrong; words that (are) missing, and words that the are unnecessary. It truly blows my mind when I find such errors in my manuscript and confirm that such errors exist in earlier copies of the same chapters. I don't know if it's my familiarity with the material that is the problem, my tendency to skip along so I can continue writing or both. It makes me want to pull my hair out.
After I publish A Mage's Power (it will published no latter than New Year's, by the way) I will begin revision work on the sequel, "Looming Shadow". Once I get the story where I want it I will likely find an editor to correct the errors listed above.
One thing is for sure: I will be aware of sticky keys, especially the 't'.