Estimating repairs? How did you learn to do it?

[Edgar Gonzalez]

Hey seasoned investors. I am new to the real estate game. I am wondering how you all went about estimating the cost to fix up a home. Did you pay a contractor to teach you? Or what would someone with experience recommend to a newbie investor. I just don't know what road to take and I know when doing flips every number counts especially using someone elses money. 

Thank you!