Easy enough, you take all the documents required plus fotocopies and go to the Amphur where you are planning to live. Not expensive, takes up a few hours, you can go get drunk afterwards. Best thing, if your GF never did it before, is to go to the Amphur and ask how to do it, early in the morning.
You first need an eligibility to marry document from your embassy in Bangkok, probably the most onerous bit, needs two visits, official translations, patience and a little money.
Dolt: a dull or foolish fellow
Last edited by cooked; 4th February 2013 at 06:44 AM.