C.,
First of all let me say, good for you!! What an accomplishment that you have even started this process. I am here to tell you that it is going to be tough but you CAN and will do it. I went to school full time when my daughter was little. Actually, I was pregnant with her while in school then went back after having her. I have been in graduate school now since July 06 and God willing, will graduate in Apr 08 with my MSW.
This time around I have two children. The most challenging part for me is keeping up with the housework. Somehow I have been able to manage doing homework after the kids go to bed unless it is some major project, then I go to the library while my hubby is at home with the kids. Going to school and having kids requires a lot of letting go. By this I mean, you are not going to do everything perfectly. Something has got to give. One thing I can suggest is to simplify.
I used to hate "wasting money" on paper products. But, now I find it is worth my peace of mind. I buy paper plates and cups and that is a time saver. Give your 6 yr old some simple responsibilities such as emptying bathroom garbage or picking up toys at night in the living room and give him an allowance. He might really like it. Also, I find that if I make a point to spend some special time with my daughter (8 y/o) she is a lot less likely to feel slighted. But, just know that there may be times when everybody feels like they are not getting what they need or they are tired of you being in school etc. This is when you regroup, reprioritize and move forward. These times will pass.
The last two years have been hectic and crazy and on a few occasions I thought about dropping out of school but I am so glad I stuck it out just 2 1/2 more months to go (but who is counting). I also try to keep in mind the example that I am setting for my children, especially my daughter. I have talked to her about why I am going to school and how it will enable me to do what I want to do.
Be creative and make the best of it. Once you let go of having to "do it right" things will fall into place and you will find what works for you. Think outside the box. Your kids don't have to know if you are stressed and throw togethr hot dogs and chips for dinner. You can make it fun and have a living room picnic (although my 2 yr old usually runs away when I have these). I know I am babbling but I hope this helps. I would love to hear how your journey unfolds.
M.