Question: So once you’ve started, who will bring it all together?
Question: Can you handle the potential loss of control of the project of delegating some responsibilities?
Question: Do you have the experience to bring together such a complex project?
Question: Will the role be fulfilled by you or someone you pay (an architect or building project manager)?
Question: What professionals are available in your locality with the appropriate skills and experience?
I think by the time you’ve worked through those you’re going to have a pretty good idea of the way to go and the shape your project is going to take.
For us, as both of us have extensive project management experience we’ve taken the leap (along with support from a very competent designer) to manage the project ourselves.
Wish us luck!