Vermontgirl~ I am leaning towards homeschooling my two very high-energy boys that are almost four and two years old. My number one fear is getting seriously burnt out. So...thank you for posting this question!
At the moment my dh works a lot of hours and we can't afford a regular baby-sitter so I always imagined having more personal time when my kids started school. I have been a SAHM since the birth of my oldest and it's a tough job! I have come to the conclusion though that homeschooling without going crazy must be possible.

When dh and I discuss the possibility of homeschooling here are some of the ideas for staying sane we have bounced around:
1) definitely join some sort of homeschooling group to have support and adult interaction
2) dh is going to try to stay home a couple of mornings a week and take over the homeschooling duties so I can have some free time (my dh owns his own business so I realize this is not an option for everyone)
3) if we have the money down the road I am not opposed to hiring a mother's helper a few hours a week
4) I find what works best for our family is having a few scheduled activities like swim lessons or music class throughout the week, it gives us some structure and time flies when we are all having fun!
5) Dh and I try to have date nights a couple of times a month after the kids are asleep, we hire a baby-sitter and catch a movie~ it's immensely restorative (also, sometimes one of us stays home one evening with the kids and the other person goes out with friends)
Good luck!