Unless you are a professional proof reader, it is inevitable that you will always miss something (but then I wonder, do professional proof readers miss things too?).
It is surprising how one can read a manuscript multiple times, catching double-spaces, incorrectly formatted dashes and dots, missing words, extra words, and yet on the hundredth read discover an entirely overlooked error – in my case missing speech marks at the end of some lines.
Relying on speech & dictation to catch things for you is a very useful method (particularly for spotting typos) – but it is not to be relied upon 100%. Only yesterday my reader Alex decided to add ‘that’ into my sentence. Clearly he thought the sentence was better with an extra demonstrative pronoun.
A formatted manuscript is much easier to spot mistakes in than a non-formatted manuscript. I suppose it’s the increased space between lines, the fewer words per page, or something.
Fewer words per page and a smaller page size means that you’ll have twice as many pages to proof read, yet somehow because of this the whole task seems to go faster (120 pages per day! Woo!).
Knowing when to stop proof reading is a real issue. How many times do you go through it? With each change lies the potential for fresh mistakes. What if you have a blind spot to the difference between her and his? You meant his, but you typed her. You might not see you typed her until your book is already in print.
I suppose the above is why I am asking friends and family to read through my manuscript for me (trusting, of course, in their superior ability to sense typos in a sentence – much like those who sense a formidable, horrible disruption when one digit is off in pi – can you? 3.141592653589793238462643383279
The fear of releasing one of those books that we’ve all come across – when you’re on page seven, and a word is missing, or wrong, or repeated – is quite possibly irrational, but also very real.
Don’t try to proof read if you’re tired or hungry. Unless you’re in the right frame of mind whilst reading, you will approach the end of the chapter with the feeling you have not done as well as you could have, and then resign yourself to combing through the same pages again later, when you’re feeling a little less useless.
With all the above taken into consideration, a novel can always be amended to fix any overlooked errors. After all, we all know that’s what editions are really for, right?