Don’t risk compromising the quality of all your hard work by not budgeting for an editor and proofreader. An editor will craft your manuscript into a professional publication before layout. A proofreader will ensure that after layout there are no errors that may have been missed and those pesky ‘orphans’, ‘widows’ and misalignments are rectified.
I’ve seen many manuscripts in the self-publishing arena that authors felt didn’t need editing or proofreading. A spell-checker or a friend are not equivalent to a professional in this field. As an author, you have invested time, expense, energy and emotion into creating your book, your baby. Don’t get pipped at the post and decide to skip the vital last steps. There are many qualified people who can help and they don’t cost the earth!