J.T.
I love working...I think it helps me be a better mom because I need the adult interaction and really makes the time we have all that much more precious. I about went insane while on maternity leave after my daughter was born. I think the most important thing is to ease yourself into it. It should be easier since the girls will be at school with you so they are apparently school-age and you have been separated before, but you might want to find some way to spend a few days a week, or a few hours a day outside of the home and away from them to get yourself used to being away. At least for new moms, I think the reason so many fail to return or quit shortly after returning is because most people feel like they have to return full time immediately, which doesn't really give you time to adjust to being away and to develop some emotional stability about your child's well-being while you are gone...Maybe not as big of an issue for you, but you might consider it nonetheless. Good luck!