I did this when my kids were 3 and 5. It's definitely not easy. One thing that helped was the day care at the college since my mom-in-law had originally offered to help take my youngest son from one preschool to another while I was in class then changed her mind after I started my courses. Without RELIABLE child care while you're in school, there's no sense in even bothering.
Once that's out of the way, you also need an understanding husband who's willing to help out with the kids even after he's home from work and wants to relax. Otherwise, you'll have a heck of a time getting those essays done in time and studying for finals and mid-terms.
You say you have a part time job. Will they be flexible with the hours they give you? Your schedule will rarely be the same from semester to semester so if they're not flexible, consider working on campus. I was an English tutor and worked at the school paper for extra income. Don't consider any loans you can get over and above what you owe the school as a source of income or you'll find yourself in deep debt once you graduate and possibly in over your head for what you can afford. This happens to a LOT of people, myself included, because it's easy to think this $2000 would come in handy and I can pay it back later. Before you know it, that $2000 is $20,000 on top of what you DID need to pay for your classes.
Also, be sure to make yourself a priority. I started out full-time at a community college and during the last year there, I helped my sis-in-law through a NASTY divorce. I focused too much of my energy trying to help her instead of letting her stand on her own two feet and by the time I graduated, I was about ready to have a nervous breakdown with all the demands I'd put on myself and from my family. So learn to say no to family and friends. "I'm sorry. I'd love to but I can't." Otherwise you'll overwhelm yourself.
Finally, consider going part-time to school. When I transferred to the state university, I knew I wasn't going to be able to keep up at that full time pace any longer and I was right. Part time was a HUGE relief. Just two or three classes made all the difference than adding a fourth. And I took summer classes (five short weeks, same full credit) so I still graduated on time as if I'd been going to school full time.
Check into online classes that your school offers. My community college offered a large variety while the state school offered a basic selection. I was disappointed with the state school because I'd taken online classes through the community college and they were great. I got to check into when I needed at home (a minimum posts are required every week) and it allowed me to be home with the boys. Just make sure you're the type of person who will follow through on your own without a lot of pushing if you take online classes. It'd be too easy to ignore the class if you're not. But if you're the type to stay on top of it, then it's a HUGE time saver and all your class notes are already presented in writing for you through the professor's online lectures. Just copy and paste. I loved that aspect of it.
Finally, ENJOY YOURSELF! Going back to school, I really enjoyed learning. Much more than when I'd graduated and it felt like 13th grade instead of higher education. Take classes that will interest you and have fun! It won't be easy but you can definitely do it.