How do I get accurate numbers when analyzing deals?

[Colton Blessen]

I feel like I'm "fluffing" the numbers too much when I am analyzing properties. What types of resources should I be using to get more accurate numbers? I'm currently using rentometer, homes.com (for home values), and a few other websites. Are these trustworthy sites or are they just ball parking the numbers? What are your opinions on the best sites to use and the ones to avoid?

Thanks in advance,

Colton