I thought I was an OK investor, now I know I'm not; I just got lucky.
Pete Comley's book is free and excellent. Even if you are not new to investing, there is much that will surprise you. In any event, I feel sure you will want change something about how you invest.
The book is written with the UK investor in mind, but in fact has lessons for all.
I may have further thoughts after digesting this book. For now, follow this link to download his book: