Quick answer: generally no separate court order once a personal representative is appointed for an ordinary sale, though it's subject to the will and any court-imposed limits. Run your own numbers in the Nebraska probate real estate sale calculator.
It comes down to who holds authority
A small estate has its own signer
For a qualifying small estate, the entitled successors sign the real-property affidavit themselves — a genuinely different process from a court-appointed personal representative selling on behalf of the whole estate.
Once heirs hold title directly, everyone has to agree
Once heirs hold title directly as co-owners, a whole-property sale generally needs all of them to sign unless a court orders otherwise — a common source of delay when siblings or other co-heirs disagree.
An out-of-state decedent adds an extra step
A domiciliary foreign personal representative can sometimes file authenticated copies of the out-of-state appointment with the Nebraska county court where the property sits — though a local ancillary administration is still needed in some cases before a sale can close.
A local probate attorney can review your estate — many offer a free consultation.
Douglas County and Lancaster County process these sales through their own County Courts, but the sale-authority rules apply identically statewide.