Why not just partner up with the General contractor or handyman?
I our case, I am a Realtor and my partner is a GC. I find the houses, do the wheeling and dealing, he manages all repairs, and then I sell them. We are both co-owners in the business and share all the expenses including the cash to purchase the properties.
Another suggestion is to learn some of the costs associated with making the repairs yourself and guesstimate the reapirs. If you have done some home repairs in your own house, then you know where the nearest home depot is located. Learn some of their prices.
Good Luck,