You couldn't do the work yourself (material only) without permits for the money you state. 

The two of us can now share best practices, where to buy cheap materials, who has cheap insurance, mortgage lenders, contractors, community insights, strategies, even renters that we liked but decided to go with someone else.

I have a box truck with exterior service doors with materials inside that I can roll up on any repair site and fix it.

I have stayed pretty up to date on material costs, and do not think I’m over estimating myself out of deals.

I have stayed pretty up to date on material costs, and do not think I’m over estimating myself out of deals.

The company that sells the training materials is a subsidiary of a Real Estate company.  

The person doing the work should provide a written invoice with materials and labor broken out.

If it is a rehab with no plans on paper, then the house is already there and once demo is completed, I would engage all the subs so that they can see "behind the walls" where and whenever necessary to avoid the change orders as much as possible.I typically create the SOW and give that to the subs to bid, they in turn calculate the materials needed and the labor costs and provide the bid from there.

I have written about this topic a lot, because its an often confusing and tiring conversation for most.The facts are easy thought;If you want to be hands on and very involved (i.e. reviewing paperwork, interviewing trades, selecting materials, etc) then you shouldn't hire a GC.

Plus, they have excellent educational material and great mentoring.PM me if you have any questions.Good luck.