Sherlock gathered ALL of the clues from the scene of a crime even if he didn’t know if they were relevant or not. Genealogists make the mistake of gathering only what they think is important and then they miss something vital along the way. Take the time to look at the neighbors in the census records. Do background research on the location to see what was going on during that time period. Extract ALL the names mentioned in official documents. Make note of the deeds before and after the ones you are interested in. Look at everyone with the same name in the same area and develop a profile on each one of them. Over time you will be able to figure out which facts go with which person and then you will be able to exclude those that don't belong to your person of interest.
“As I watched him I was irresistibly reminded of a pure-blooded, well-trained foxhound, as it dashes backward and forward through the covert, whining in its eagerness, until it comes across the lost scent.” [Watson observing Holmes, "A Study in Scarlet"]
“Well, Mr. Holmes, what are we to do with that fact?”
“To remember it – to docket it. We may come on something later which will bear upon it.” [Inspector Lestrade to Holmes and Holmes' response, "The Six Napoleons"]
"I had at the outset no particular reason to connect these journeys with the disappearance of Godfrey Staunton, and was only inclined to investigate them on the general grounds that everything which concerns Dr. Armstrong is at present of interest to us…” [Holmes to Watson, "The Missing Three-Quarter"]
"Much of what I tell you is no doubt quite irrelevant, but still I feel that it is best that I should let you have all the facts and leave you to select for yourself those which will be of most service to you in helping you to your conclusions.” [Watson to Holmes in a letter, "The Hound of the Baskervilles"]