In Thailand can give to some agent to do this for you ,translate is around 1400 baht they can help you very much to finish very soon with district, also you Wil need and two witnesses, it's really very easy to do no need to stressed about it ,I finished this in chiang nai
My friend if you married in Sweden you need first translate certificate of marriage from swedish in English and then receive stamp from ministry of foreign affairs in Sweden then you go in thai embassy to receive stamp ,when you finish this you must translate in thai language and receive stamp from ministry of foreign affairs in Thailand