@Luwani Nunez Prices you get from contractors will have a very wide range anyway, so it's probably ok to use that as a guide until you are actually under contract or close to it on a property.

I'm very handy, generally pretty sharp with numbers, and have access to a wide plethora of contractors who are very reliable/reasonably priced, so I would really like to give my hand at renovating/selling homes.

Then finding out the hole is still not wide enough and having to shave off another inch of rocklike clay so the pole will fit in. 

I don't understand what your actually question is.The 70% rule is a rule of thumb, and it is widely accepted throughout the circles of professional investors I've met and talked to.

Feel free to take in the wide resources here. :)

It is about 7/16" thick and 1.5"-2" wide ane has the rubber seal flap on it.

When dealing with local private money then the rules are  whatever that investor will do and vary widely.

We have taken on people with a felony or eviction, but we do so with eyes wide open. 

That can cast a pretty wide net. 

The Big Daddy's lunch really is great - there is a wide mix of backgrounds (investors, wholesalers, developers, title guys, money guys, and even a self-described organic lady who does almost all of the above) and it is always packed, so get there on time for sure.