For fixed wing private flying you are looking at at least hundred hours fully dedicated to new knowledge and skills at an expensive rate. That's assuming you are proficient at learning and able-bodied enough to pass medical.

Unlike driving, when flying you can't just safely pull off to shoulder and stop to figure out whatever problem you are having. So there's a lot effort spent on ensuring whoever is flying is able to prevent known issues and handle emergencies in a non-tragic way.