Historical fiction.
May I suggest for everyone in your pickle, Laurie, that whilst everyone agrees that you should just write it does hamper one so not being sure of those little details.
First you need some pictures of the people and places in your time period.
Museums, history societies, children's books and the internet may provide you with some. Surround your writing place with visual reminders so you know if your heroine can really run fast in those shoes or skirts or on that street of cobbles.
Go and haunt a good children's library and look at the history books. Children aren't supposed to know anything so you get answers there. I had to hunt for a children's book until I had a good picture of a 17thC tinder box. If you can immerse yourself in children's books with pictures it will help. Keep thinking what would it smell/taste/look/sound like to be there.
There's a BBC series now on DVD - Tales from the Green Valley - where 5 'practical archeologists' lived for a year in a 1620s farmhouse as if it were 1620. It's serious TV, not infotainment, and just watching that gives you a huge amount of detail, details that span from the Middle Ages right up to the early 19thC because what you wore, ate, and had to do on a farm and in the garden and in the house didn't really change radically until the early 20thC. (Yes, that is stretching it and generalising but for Laurie and others new to historical writing it's a fair generalisation.)
What helped me early on writing historicals was to ask myself this simple question - If there's no ...? about everything. And write down the answers as they would affect my main characters.
E.g.
If there's no supermarket how do people get their bread, beer, meat?
If there's no town water supply how do people get water?
If there's no electricity how do people get light or heat?
If there's no petrol or cars how do people travel?
If there's no telephone how do people get to hear things?
If there's no TV and radio how do people learn things?
If there's no doctor how do people heal themselves?
If there's ...
And so on until you feel you know enough to write.
Then concentrate on the characters and their relationships in the story.
If you are going to write historicals you have to read widely absolutely everything from popular novels set in the same period you're writing in, children's history books, adult history books and University texts and collections of letters and diaries.
Do you know
http://www.pikle.demon.co.uk/diaryjunction/ where some kind soul has linked many original dairies, letters, geological and university theses using diaries and letters so that you can access the sites and read the originals?
You'll never know enough no matter how much history you study but you will absorb enough to imagine the feel of the clothes and the smell and the weight of them and a little of how your characters might think and react. Then you can write more easily always acknowledging that you will make mistakes and that someone will gleefully correct them for you.
Right now just go for it but do use the XXXX system so that you can go back and fill in the details as you acquire them. It is a question of confidence and having some of that writer's arrogance!
Good luck
pdr
P.S. Many readers of historical fiction want historical accuracy and say so loudly. They like the little details and the main facts to be correct. However you can give an explanation of why you deviated from the known facts and if you've written well enough you can carry those readers.