This is timely for me. I need to do the same in a few weeks. I have a one year ME visa. My 90 day stamp expires April 10th. I need a 60 day extension since we have no plans for a border run and I'll be going home in late May anyway. We've done this before, but always seem to go unprepared. Best I can remember is that I need the completed TM 7 form, my passport and E visa hardcopy (with copies), a couple of passport photos and the 1900 Baht fee. Seems like it can be done at any time before it expires. I'd rather do it before the end of the month to avoid any of the potential Songkran crush. Any other tips?