I started by wrapping tinsel garland around an extruded styrofoam wreath. The extruded ones are the ones that are completely round, not flat on the back. Wrapping the garland provides a good background as well as making the back of the wreath look nice. In hindsight, I should have used more garland, but all turned out fine. I started by hot gluing the ornaments around the outside like the tutorial suggests. These wreaths take quite a bit of glue (which will probably result in burning hot glue on your fingers) and quite a bit of time. This isn't a quick project, but they are so beautiful, they're worth it.
Sorry for the blurry iphone photo. Keep filling in with more ornaments. You'll need more than you think. Definitely get some extra small ornaments too to fill in the gaps. Here it is again, the finished project:
Don't be afraid; try it!