How to effectively calculate ARV?

[Joey Samudio]

Hi, I am looking at doing my first fix and flip soon and was wondering what the best way to calculate ARV is? Do you usually work with a real estate agent to calculate this? Is there a good software out there that helps calculate this? I am currently trying to use both zillow zestimate as well as trying look at sold comps on zillow, but I am slow at this and not highly confident in my ability yet. Let me know your thoughts and tips on this