Historical time helps shape your characters and story line, but it's not the defining ingredient of your novel!
Yet many of us get addicted and/or overwhelmed by research. Many times I’ve had dig myself out of a mountain of research.
So what’s the answer?
Don't jump into research before your characters have some flesh and blood.
Don't believe everything you read on the internet. You don't need to be 100% accurate. I've had editors ask me to make changes because the facts, no matter their validity, didn't make sense to the modern reader!