DNA testing will not solve all your genealogy problems. It is only one tool. It can confirm that a relationship exists between two people, but it needs to be used together with other genealogical sources to establish the precise nature of the relationship. DNA testing won’t tell many of the biographical details about your relative that will be in other records.
One can’t simply send their DNA to one of the sites and expect to have a completed pedigree chart returned to them. It’s more complicated than that.
I’ve finally taken the plunge and ordered a DNA test–which will be discussed in more detail on my Rootdig blog. I’m hoping to get some clues, but not a completed pedigree chart.