What is the process for applying for a Non-Immigrant B Visa at a Thai consulate in a neighboring country after arriving in Thailand?

Hello all! American here about to make the move to Bangkok for roughly a year to teach. Due to documents from my school getting lost in the mail, I was unable to apply for the non immigrant b visa in the states. That being said, I will have to fly into a neighboring country shortly after I arrive in Thailand to apply for this visa. Has anyone had experience applying for a non immigrant b visa in a neighboring country of Thailand after having arrived? Are all Thai consulates relatively similar as far as required documents? Let me know your experience, thanks!