That very question was one of the reasons I turned our portfolio management over to an independent CFP firm.
Scenario 1: If I die, it gives my spouse someone to ask questions of, who has experience in advising senior-age clients.
Scenario 2: We have no children. Spouse has high probability of eventual dementia impairment. Should I die and he becomes non compos mentis, our heir is absolutely honest/ethical, but also completely inexperienced in dealing with both mid-sized estates and seniorcare issues.
The biggest problem in dealing with a situation you know little about and have no experience in, is not in getting advice (you'll get plenty of that from everybody, most of it both free and bad). It's knowing the right questions to ask.
A good professional can help - but you have to find one or know one. I would not rely on her personal network to do either. We are very confident in our team of advisers, who have been working with us for over a decade, to help her avoid making serious mistakes.
I learned when I was working for a CFP that the IRS is very definitely NOT forgiving of mistakes by heirs, no matter how well-intentioned the action was. And half of those mistakes were made by will executors and trust trustees, who didn't realize the tax consequences of what they were doing!