I agree an attorney would be a great idea, but what I've found with my own parents is they use their "old friend who's been an attorney for 47 years" who doesn't know jack about real estate.
First, I you've come to the right place, please try to find an attorney on this forum who has knowledge and experience on the subject. I've found with my own experience with my parents the older the attorney is, the less "evolved", so just a heads up to arm yourself with background on this in order to ask the right questions.
I'm trying to unscrew what my parents have gotten themselves into as well- they felt becuase "theyre on the deed of trust" in the county, all is well. Now they have tyo foreclose. and there was a liquor license involved and the transfer done illegally. According to the attorney--who advised them in the first place. My parents have seller financed before--they're not newbies, but they lucked out the prior two times. Save the heartache and VET the attorney.