Jen,
I'm new here, but we've homeschooled from the beginning (Dd is 9, would be 4th grade).
I'll second Dazed - a good "decompression" period is often called for when bringing students home to school.
However, if today went better - Hooray! Don't get discouraged, though, if you have a set-back. It's going to happen. Actually, yesterday (Monday), it may have been in the stars - we had a rotten homeschool day, too.
Cyber-hugs on that, btw.
Since you've had exposure to the public school system, try to remember what that was like for you, your dc, and your family. Homeschooling isn't for everyone, but sometimes it's hard to keep perspective. A journal (for Mom) helps a BUNCH! It can keep you sane as you go forward, especially when you can note problems, but then go forward and see the solutions.
As for reluctant family members... BTDT! Still dealing. Some will come around, once they see how well your child is doing, the positive changes, etc. My parents are still on the fence, usually, though Mom tends to fall off on the negative side a lot. LOL!
If they can't be supportive, then we just don't give them an opportunity to be otherwise - we don't discuss Dd's education, accomplishments, or anything with them. We talk about hobbies, camps, projects, etc (which are, in fact, "school") but NOT education, workbooks, tests, grades. In fact, my parents "lost" some of their time with Dd when they started haranguing her about homeschooling when they would have her for the day. They don't get to "babysit" her any longer, nor have her overnight alone, because of this - at Dd's request, I might add.
If you have an only you are homeschooling (or just one schooling at home), might I recommend taking at look at the Homeschooling Only One website -
http://hoo.donnac.com/ ? There are loads of kind folks there who are extremely supportive. I'd guess about 50% of us have difficult relatives when it comes to hsing.
Sorry this is long, but HTH!