I currently have to do a quick new market study to quickly filter out a market and it is tedious.I do believe the big names brokers are overpriced.

Are the people that give bad feedback on the reviews actually the lazy ones who sort of half commit themselves, put half *** effort in studying the material and submit half cocked deals to Jerrys buying team only to be rejected and when they dont make any money in 30-90 days just get angry and decide they will give a bad testimony on rip off report?

@Jeremiah Mon education is vital but make sure you take action on the items you study.

For the first part of your question even if you were working with a realtor, I don't personally know many that have a true pulse on rehab costs and I wouldn't make any investment decisions based on their rehab cost projections.My suggestion would be to study how to evaluate the Big 6 rehab costs: roof, siding, windows, HVAC, electrical, and plumbing. 

Print them off, study them, highlight them, make notes, read some blog posts, and understand the subject.The second document he links includes precise definitions and a guide for landlords to use for screening support animals.

Quote from @Jamie Hora: The question you pose in the title, "Is a rezone required if availability study can support more density". 

Please study engineering and you’ll have more of a grasp of why measuring amperes (electricity) or volume (water or natural gas) lends itself to reasonable precision.  

Due Diligence and Feasibility Studies - What studies or tests are essential before purchasing raw land?

Studying for and receiving the CCIM designation will be a solid plus.  

Quote from @Melanie Baldridge: A question that we get:"Does the IRS require site visits for cost segregation studies?"