Darren in the beginning you have to "fake it till you make it"... a little. Be the boss, owner and remodeler. BUT also be humble and ask A LOT of questions. Contractor will appreciate honesty and "your hustle" and desire to do more deals and bring them work.
I want to be careful saying "fake it" because there is a balance between that and being a newby. But "if" you fully intend to buy and remodel a property then start getting bids, building relationships and start your business.
If you are just looking at Wholesaling then use your buyers list to help evaluate a property and DO NOT waist contractors time. The other investors will come and tell you costs and what they will pay (after you have a contract in place).
Figures for me in Southern Utah:
Paint: $2 a ft.
Carpet $14 a yd.
Granite $36 a ft
Sod $.25 cents a ft
Cabinets $50-$75 per box.
Tile is $4.50 a ft to lay plus purchase of the tile.
Labor, Demo, Cleaning, etc.
ADD 20% to the final number!!!!