You do have a right to visit your property.Unless they are not paying rent you may be at the mercy of the court as they may give the tenants 3-6 months stay till they find a place but all the while they still have to continue paying rent.

What does it mean when the court issues "notice and information to heirs and devisees?"

Who wants to go to court to find out?

In my area, they seem to be an agent for the trustee (per court documents) and in that capacity can't really dictate the sale process.

What recourse do I have if I want to appeal his decision?

It seemed appealing because I was interested in living in the property regardless and with a much lower down payment to my understanding it would be easier for a student like me to save the money for a reasonable down payment.

If I were you, not only would I look at if you doing the right thing morally, you want to make sure your decisions are easy to uphold in court.

I'll also want to add landscaping and rent it out with nice curb appeal.

lesson learned in court

This is an estate, so the contract is contingent upon court approval.