Be flexible with your kids and the curriculum you chose for them. If the writing curriculum you chose doesn't work out, don't be afraid to try something else.
Let the older siblings help the younger, as long as the younger ones are receptive. Everybody wins in that situation.
Allow for some unschooling: go to the library and let them pick out a subject they would like to learn, besides where you're at with your curriculum(s). This has been fun with my 6 yo who wants to learn about all 50 states!
Don't try to imitate the public school classroom. Let it be an environment that they can learn in. If your child feels more comfortable sitting on the floor, let him/her as long as it's in a good location. (not totally in the way)
Don't beat yourself up over your mistakes. You're only human too and God does allow second chances!
Take whatever homeschool advice that you think works for you. It's like being pregnant, everybody has their own labor stories!!
BTW, I've only been homeschooling for a month. Not bad, huh?