If you ordered a DNA test and are waiting for the kit or waiting for the results, do more than just check your mailbox for the kit or your email inbox for the results. Get prepared. One way to do that is to analyze what you already know about your ancestors. Work on making your “paper pedigree” as complete as you can. If you’ve got a line extended as far back as you can, try tracing down descendants of branches you’ve not worked on. Doing some of that ground work will help you to analyze your results when you get them.
And remember that you may make surprising discoveries. These surprises may involve close relatives.