Here's some tips suggested by WritersDigest.com on book self-publishing in relation to "DIY" versus seeking professional help.

1. Do it yourself: There are lots of tasks you’re going to be doing yourself regardless of how you go about producing your book. But some authors enjoy taking a truly DIY approach to the entire process, including the challenge of trying to produce beautifully edited pages and attractive covers. While lots of authors take this route, that doesn’t mean it’s always a good choice. It may look simple, but book production is actually quite technical and requires a specialized kind of expertise. So think back to the goal you established for yourself up front. If getting there is going to require impressing critics, agents, publishers or book buyers, be aware that you run the risk of looking like an amateur if you “hire yourself” to do these tasks.

2. Hire professional help: If you want to create a book that looks truly professional, you’ll almost certainly have to hire professionals to work on it. You’ll need at minimum a good editor and a competent book designer. Down the road, you can also consider seeking assistance with tasks like designing your website and marketing the finished product.

In the above video, an AgoraPublishing.com volunteer representative makes a presentation on book self-publishing.