I wrote my first book around twelve years ago, self-published without using an editor. It was reasonably well received, although I felt the need to rewrite it a few years later.

There are a huge amount of unedited writers out there. If you are writing for your own pleasure and are not too worried about making money, it can be an enjoyable pastime. 

Why not do your best work, have it printed and then give it to friends and relatives for their honest opinion? 

There's a lot of great advice in the book overall. The first time I read it, I found the advice to avoid all adverbs a little jarring, but have since come to see the wisdom in it.