@Joe Splitrock and @Cat Storing I think there is a lot of credence in what Joe is explaining here. I believe that at some point almost anyone can understand a calculator and get an understanding of the analyzation behind the structure and the "deal".
That being said, putting everything together with the numbers(finding the right investment) is only the first step. Understanding the rehab costs and how it will effect the calculations and THEN still putting in the offer(with the actual intent to purchase) is the hard part. It has happened to me. And I haven't purchased anything just yet.
However, I have put in offers on 3 separate properties(none of which have resulted in a deal) at numbers that would "make sense" as the investor. I believe that both patience AND readiness both need to match up and align at the same time.
I have had to stop myself from putting in an offer on a property recently, just because of the frustration of not getting the first 3 offers we put in. Now when you find the right deal, you definitely need to be prepared to move forward, or you're just wasting your time. We have found another property that we will most likely be putting together a purchase agreement soon. If we don't get it, we have to move on!