They read a book.

I have read a lot of books published by bigger pockets and other authors on real estate investing.

And prior to that, it likely took her hours to research this specific topic, and years to get to the level where she can answer without having to read the reference book.

I read David Greene's BRRRR book and begin my real estate journey.

The check book control package look attractive, at $1095 after a July 4th $200 discount :-) https://www.broadfinancial.com/self-directed-ira-plans-custodian-checkbook-control/I will need to set up one with pretax 401K , then another with after tax Roth IRA, so, want to make sure to control the expenses/cash flow of start up costs. 

Be sure and read @Avery Carl's book, Short Term Rental, Long Term Wealth, published by BP. 

You may pay a bit more and make a little less, but playing the long term game is key in real estate.The types of structures could be lump sum (one price) or cost plus (meaning you pay the cost of material and labor plus a flat fee—more of an open-book model).I see some investors who want to pay for ALL the materials, which is excellent for the investor (more control of finishes & cost) and general contractor (if they are getting paid well).  

Quote from @Reese Shulman: J Scott wrote about this in one of his books.

Here is a summary of the book.https://www.nateliason.com/notes/long-distance-real-estate-investing-david-greeneThe book also mentions the importance of having a rockstar Realtor, contractor, lender, and property manager.

Make sure you take advantage of the various resources (books / team builders / calculators) while you learn and get ready for your first purchase!