Lack of action. Being your own boss can sound good but has its cons. You don't owe any report of progress to anyone. So it becomes, "I'll do it tomorrow" and the tomorrow never comes.
Plus, working from home can be advantageous but it has a lot of challenges - distractions, interruptions, waste of time...and your partner/family do not usually take you seriously when you're working from home and thus don't reach out voluntarily to support.
One other motive is they don't look at the final goal and work for the result. The majority do things for the sake of doing them and not as a step further to reach their target.
Others try to do it all by themselves, without proper tuition from those who mastered it. They get some training on this and that, have some pieces of the puzzle but don't know how to fit them all together.