[muzani]

It sounds like a motivation problem. Are they getting enough equity? Are the rewards big enough? Do they trust that it can be successful with the time they need to put into it?

Something that is large and intimidating, but potentially life changing, is exactly what would make people procrastinate forever.

I would say you should aim lower. Make a subset of the big idea. Hack it as fast as possible just to see if it would work rather than trying to build it right. Assume the MVP is there just to gather information and not the actual product.

Once you get to the point of "I can finish this next week, no problem", it becomes a lot more motivating to do.