Try to stay away from court appointed lawyers, because their caseloads are really heavy and they will typically not be able to give you as much personal time as a hired attorney. When you are paying for their services they tend to be more personally invested in trying to win your case. https://www.usapostille.com/legalization-services/oman/">Oman apostille
Don't hesitate to ask for proof from your lawyer. A lawyer can claim that he knows a certain area very well, but this does not necessarily mean it is true. Find out what the rates of success are, as well as what areas they were in. Remember, an attorney who specializes in finance is not the best choice if you are in a criminal trial. https://www.usapostille.com/legalization-services/oman/">Oman document legalization