How do I know I'm analyzing deals correctly?

[Julio Velazquez]

Hello BP,

I often hear there are deals everywhere, some even say they got their first deal from a listing off MLS, Zillow etc.. I've been using the BP calculators to analyze deals but a lot of the information being asked is all estimates.. For what ever reason the area I'm looking at when I search for comps in the area on zillow or trulia usually other properties with similar price points were sold. The rehab is an estimate as well, So how do I know I'm analyzing the deal correctly?

I know you have to look at around 200 listing to probably come across 10-20 worth actually looking at. 

The uncertainty of doing it correctly is a little daunting..

Thank you in advanced.