@Ron *******
I suppose it depends which route your going to go down, do you want to do it yourself?? Or are you going to use an agent?? If you want to do it yourself, and you have everything in place, money in the bank etc etc, I believe it's a very simple process, to apply for the initial non O, based on marriage or retirement, through the Thai e-visa website in your home country, before you come to Thailand, if you want to do the initial non O in the country yourself, some immigration offices, will make it very difficult or impossible to do it yourself, and they will suggest you apply at the thai consulate in Vientiane Lao, and then after 60 days, return to them for the 12 months extension based on marriage or retirement, if you decide to use an agent it is very easy, if your entitled you can just arrive on a 60 day visa exempt, and extend that for 30 days, that gives the agent enough time to complete the whole process, everything will be done for you. I'm no expert, that's to the best of my knowledge, if anything is wrong hopefully someone will correct me.