Doing that doesn't remove the necessity for you to know what you're doing, at least to a reasonable extent.

Need is the mother of necessity and we are all wishing you the best of luck!

So, if you are average, you make $30,000 a year doing flips full time.If the average is $15,000 then that by necessity means a lot of people make less than $15,000 per flip and some lose money.

Otherwise you will end up like many people who buy at the top of their budget and become house poor.Getting a value add property is also a necessity. 

Networking through REIA's and other avenues with local investors is a necessity.

POOL in Florida is a necessity.

It goes without saying that communication skills are a underlying necessity in all forms of RE investing.   

It also creates a necessity to maximize rents to maintain a semblance of value and cover the increased tax burden, especially for properties that have run out of depreciation.The value of properties actually drop, because they lose utility in terms of exit strategy, so it degrades current wealth.It also eliminates a path to wealth for anyone who isn’t already wealthy, thereby decreasing upward social mobility.If there is no step up in basis and an elimination of the $11m margin before inheritance tax kicks in, properties will be forced to be sold to pay inheritance taxes, so there is no way to create a legacy.  

Honestly a mortgage is the only thing I would put in the first category and even then, I'd say it is a necessity because in the long term owning your own house is a good thing. 

Patience and reserves are necessities.