How to accurately estimate ARV w/o experience?

[Paige Clarke]

Hi BP Network-

Need help-

How do I go about estimating the cost of potential repairs for a house/condo if I have limited experience with rehabbing and GC costs. I especially am unsure because I am new to the NJ market and am not sure if the costs drastically change for location/supplies/labor/etc. 

I know I can head to a Home Depot and estimate supply cost if I have an idea of the square footage/area coverage. However- in regards to labor, I want to learn, but don't know how to go about this without putting something out for a real estimate. 

Question: How can I become more knowledgeable and better educated about estimating these costs so I can have an accurate ARV?

Thank you!