I had to learn to reorganize my time. Time management is so important. There may be times your sleep will be short but in the long run it's well worth it. My older children had to learn to help in the house a little more - I made sure their chores were reasonable and that they were able to maintain them responsibly.
One of the hardest things for me was letting messes happen - it initially drove me crazy lol but then I learned that there's a big difference between having a mess and being filthy - and by no means were we filthy lol
The other hard thing was making sure I was still able to give my kids enough time. I prepared them by letting them know that i was going to be going back to school and there would be less time for me but reminded them that are the most important thing in my life and my love would not change.
I learned that by them watching how hard I worked, it encouraged the importance of schooling to them - they realized sometimes mommy doesnt like her homework either but she has to do it because it's important to have an education. I watched them work harder at reching their own goals and I really wasnt expecting that so it worked well for us.
I made it clear that I wasn't only doing this for myself but I was doing it for them as well, along with the other people I wanted to help. They learned valuable lessons in that.
I made the most of my time with them. I still made sure we had movie night (more at home than anything) alternated for game nights, and made sure they were able to come to me if they needed me for any reason. They learned when to be patient with me, they also learned how to resolve issues on thier own, and not once did any of them come to me in sadness feeling neglected or unloved, thank God!
Talking to them and preparing them ahead of time is probably the most important thing you can do. Of course, there are also ways to give time to your spouse - any interaction, as long as you're genuine, will help him to remember he's not least in your life. Set a date night once a month for just the two of you, engage him, ask him his opinioin (whether or not you actually want it lol) Make sure he still feels loved & wanted by you and he'll be ok. Education is a great thing to invest in - you can do it - you have to figure what works best for you and your family.
God bless you.