What if you're not certain?

Don't start blindly merging or deleting people!

Never present a guess as a known fact.  (preface it with "about" or "est")

Organize all known information so you can gather the clues you need to guess well.

Read through Give Me an Estimate

REMEMBER:
The genealogical process involves a lot of guessing (or hypothesis) about names, dates, places, relationships, and sources. We start with guesses about some of these, and then go out to find the sources and evidence that prove or disprove those guesses.
This means that genealogists need to be good guessers. Good guessers use all the clues available to them before making their best guess. From this guess they form a theory, which can be proven or disproven.

Cite at least one source for every event.
The Key Principle is Straightforward: THE MORE YOU KNOW, THE BETTER YOU CAN GUESS.