Ok going off the other messages i assume this, if your in Thailand already Sisaket province, and your on a tourist visa, head down to Pattaya not Bangkok and there are a few decent agents around that can easily sort it out for you. It will take time though so enjoy the ride, and stop stressing out. Also before you leave plan your trip and checklist what the agent will need. Look online for agents in Pattaya and call them first as being prepared is everything.