It does not matter whether the comparison is net mineral acres (NMA) or net royalty acres, as long as all offers are measured on the same basis to get to the final sales price. Important for you to know exactly how many NMA you own in 150 gross acres. 100% is 150 acres vs 10% is 15 NMA vs 1% is 1.5 NMA. Attorney fees vary widely and you can use any good Texas oil and gas attorney. Familiarity with specific location would mainly matter if the attorney is advising you on pricing. # hours of legal time depends on complexity of contract and how much back and forth there is about contract terms between buyer and seller. You have to consider how you intend to market the minerals to get multiple offers. You are not getting desired detailed responses because your questions are too general. There is a lot of discussions about mineral sales on other posts here which can give you ideas.
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