Learning how to estimate rehab costs

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Hi all,

I'm trying to dive into real estate wholesaling and would like to learn how to develop the instrumental skill of estimating rehab costs. I need to get this down so I can analyze any wholesale, flip, or buy and hold deals I come across.

What approach do I take? So far I've been on the project with other investors to watch (but not enough), looked at numbers from other peoples deals, and studied up on the forums/podcasts/reading. 

Anything else? What should I focus my efforts on to most efficiently learn how to get my numbers right??