Good advice, D. Self editing will only take you three-quarters down the course, but it must be editing with a purpose, and this is very difficult after you've read the same passages fifty times. Hence, the manuscript does need fresh eyes - if they can be recruited.
There's a huge difference between editing and proof-reading. The editing process takes into account absolutely everything about a book, from grammar to structure, plot, characterisation, etc etc. It will also cover typos, although that's not the main purpose of an edit.
MJ
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