When you are homeschooling, you are it. You are the teacher. You are the administrator. You are the disciplinarian. You are everything to your children.
It may seem like a big leap.
Many people think self-discipline means doing it all on your own, but it does not mean that at all. You might find that having an accountability partner can really help you to develop more discipline.
This might be your spouse. Or it might be another homeschooling mom with whom you team tag. If you are close, you might spell each other in which classes to teach. Otherwise, you might stay in touch vituallty.
Homeschooling takes time so you should consider passing some household tasks onto the children. Of course, the tasks should be suitable for their ages. A younger child can put away toys. An older child can help with dishes or laundry.
Having a jobs chart holds everyone accountable.
It is far easier to give in and be less disciplined when you just have yourself in the picture. When you have a person or chart to hold you accountable though, you are far more likely to make sure it happens.
An accountability partner is someone you set up a contract with to hold each other accountable for reaching goals. This is a mutual pact and is probably the easiest to set up. The goals do not have to be the same ones, the point is to connect on a regular basis, often once a week, and share with each other how much you have accomplished.
You may prefer joining a group. Often there are homeschooling groups or associations you can join to help you learn about homeschooling and to share resources. Sometimes people will sell used curriculums. When you run across an obstacle, the group can help brainstorm ideas to help you out. Two heads may be better than one, but sometimes multiple heads are much better than just two.