Putting together a program This can be done independently in most states. Even most umbrella programs give the option of a cursory approval of a parent's program. If help is needed in getting started there are several options for special needs students. See end of this article. For all disabled students, there are many directions parents can choose from.
Most parents choose something in between.
For the severely disabled there is a more structured approach like applied behavior analysis for autism. The other extreme would be creating a learning environment for a child to explore at will. Each of us will probably have more than ordinary education to consider. How disabled a child is and what the care needs are. If a child is total care, the program would be very different than for a learning disabled son or daughter of Down syndrome child who can spend more time helping mom.