I have been studying the subject for a year - books, YouTube, courses, etc.

The only true difference between using a Self-directed IRA and a Solo(k) when it comes to investing in real estate is that leveraged real estate held in a Solo(k) is not subject to UBIT tax on any income earned.

Welcome to BiggerPockets @Lee Vang, thanks for the introduction.You can try using the search tool on the top right corner to look for previous topics on the subject.

The standard contract form here in TX doesn't contain anything called "Subject-to".  

I like that you suggested courses on different levels for a main subject and a back up.

I was wondering what I would have to do (as a buyer) as the intermediate step/steps between getting a seller to agree to do subject-to financing, and me actually owning the house?

It was not clear what state the subject property is located.More than likely 65% of the FMV is a pretty aggressive number for an asset with no foreclosure start.  

Since there are several types of trusts, and each have their own benefits, an Attorney is a good person to evaluate and guide you down the path of creating the correct vehicle to protect your investments, while creating tax benefits.If you decide to consult an Attorney(s), make sure you pick one that understands the following subject matter: estate planning and trusts, REITs, Federal & State Taxes, business entities, real estate, and Family Law. 

If there's a mortgage, then a subject to deal.I'm thinking this is a free and clear deal since they are willing to walk away.

There are definitely some great areas in Oakland, and condos aren't subject to rent control, unlike an apartment building.