Perhaps it would be better to concentrate on the parts of the tree you can do rather than worrying about hypothetical situations.
We all have to begin somewhere and the enjoyment from this hobby is every small step you make. I have just discovered the identity of the father (my great-great-grandfather) of my great-grandmother who was illegitimate. I never thought I'd manage that.
Some branches you will get completely stuck on, whereas others branches might be far easier to take back.
Start asking forums such as this one for help on individual people in you tree, working backwards generation by generation to avoid errors, and enjoy the journey.
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