Estimating Rent on Property Analysis

[Alaura Mannor]

Hello all! 

I am practicing analyzing properties and I was wondering how y'all estimate rent? I know BiggerPockets has their own rent estimator, but what are your backups for low confidence areas, or properties that aren't standard builds (two homes on one lot)? I'm sure a realtor could give me a list of comps for a given area that would be most accurate, but I think they would hate me if I asked for comps every time I wanted to analyze a property? 

Any advice is appreciated! Thanks in advance!