Great idea, Jenny
We also want to homeschool and are part of two local homeschool groups. Both are eclectic and don't care how you homeschool...
As for worrying about how well you can teach, just take it one step at a time. From what I've read and heard from others who homeschool is that children are natural learners and will "teach" themselves, especially in areas that interest them alot. Alot of folks we know started out with a curriculum because they felt like they needed one, but then ended up discarding it in favor of a less structured approach that is more child-led. You can always do that - whatever approach you start out with doesn't necessarily have to be the one you stick with
The way that a friend of ours does it with her 4.5 yr old and 6 yr old (while the 1 yr old tags along with another one due in September...!) is to do themes. They talked about America for several months and she read the Little House series to them at night. Then when they were in the car, she'd ask how would they get there if they were Laura Ingalls? What would they see if they looked around them instead of the traffic lights, etc.? Then they try to cook some of the foods they ate, etc, from scratch to see how long it would have taken to prepare just one meal if you lived back then. Then they moved on to the industrial age, etc. Now they've moved on to Fantasy. She just read them the whole Harry Potter series - they even got the audio CDs from the library and listened to it in the car. I'm not that organized, but it sounds pretty cool the way they do things...!
There are alot of good books but most are common sensical. The best thing we've read is the Home Education Magazine that we subscribe to (homeedmag.com).
We have alot of reasons for wanting to homeschool, but the biggest ones are letting kids be kids longer, allowing a child to explore their own interests more in-depth, and not being cooped up inside for 8hrs a day with 20 minutes recess time IF the weather is nice. We try to go outside every day, regardless of the weather: there is no bad weather, only bad dressing (someone famous said that but I can't remember who...
).
My FIL works for NEA (nat'l educ assoc) so DH is very well versed in the goodness of the public school system. However, DH knows how I feel about just wanting to try it for awhile. So he's fine with us trying it for K and 1st grade and taking it from there. If we ever feel like it's not working out for our family, for me, or for Nolan, then we'll re-adjust.
Good luck with your decision regarding homeschooling, curriculum, etc - ! I think you'll make a great teacher - seems like you and Hayley have a good relationship already and that's a good place to start