It's a good lesson for me to make the best use of all available information.
In this game, Mike, you have to make use of whatever scraps of information you can find, however slight, and wherever you come by them.
A good system of storage and retrieval of reference material, and a good index to that system, are an absolute must if you are going to try to go back more than a couple of generations. What seems irrelevant now may suddenly seem critically important later on.
So, tedious though it may seem, always note everything you find, including witnesses to marriages, whether they signed or made their mark (somebody who signed in 1815 is unlikely to be the same person as the person of the same name who made his mark in 1819, no matter how strongly all the other evidence may appear to suggest that they are), names of informants at death ... everything. At the time of finding he information, you cannot be certain what is vital, what is peripheral, and what is irrelevant information. So treat it all as critical. Record it all, file it all, index it all, cross-reference it all ...