S.H.
If you demo the bathroom yourselves, do you know the difference between a weight bearing wall or not?
Or a structural wall, beams or not?
And when demolishing things such as the floor or flooring, do you know what is under your floor or sub-floor?
Do you have the blueprints for your home, so you know the bathroom's structural layout... of the floors, walls, ceilings?
And know where the pipes are and wiring?
And if you have windows in that bathroom, then you need to be careful about it when you demo that room.
AND, do you know how to waterproof the floors and bath or shower, surrounds? And to do it properly?
If you are just taking out dry-wall, well you can just tear it apart.
But, where will you be putting all the materials that are accumulated from the demolishing? And where or how, will you be disposing of it?
Then, there is the time frame of such projects.
If doing it yourself, this usually takes more time. LOTS more time. Than if you hire a professional.
And since your Hubby will be doing most of the work, as you said, will he even have time... to do it?
For a bathroom job, its not like you need a whole team of construction workers to do it.
But you should get a licensed contractor who is bonded etc.
You do not need to hire a "Project Manager." Just a Contractor. They know how to do this stuff.
Then, if you hire a contractor to do it.... and per "buying" the materials.... keep in mind that they get you a Contractor's discount. If you bought it yourself, you would not be getting that discount.
And when having a project done, it is you that is buying the materials anyway. Even if for the Contractor. But at their cost or yours.
Not to mention, what about any building permits if need be.
Usually... with any "structural work"... you do need permits.
But with cosmetic changes, you do not.
A bathroom remodel, is either cosmetic changes (ie: changing cabinets and light fixtures and color of a toilet etc.) ... or a full-on remodel that requires structural work, as well.