I have been here for almost 3 years now.
I started by using an agent for the 800K baht method... For myself, I'd advise you to use a reputable agent, as the confusion and stress of getting the money transferred in (Use Wise, but keep your home country address as your official Wise address! Do NOT open up Wise with a Thai home address!), getting your Thai driver's licenses (You need separate licenses for car and motorcycle.), and at first, with so much coming at you, from so many directions, use an agent to get you into the country and settled... then you can start getting used to dealing with the wild Thai bureaucracies yourself, once you get settled-in and can catch your breath.
I live in Pattaya, and am now on the 65K baht/month method.
My advice is this: Go ahead and bite the bullet and pay an agent to get you settled-in and bureaucratically set-up, then, after you've got the balls rolling, you can begin to take care of these things yourself, as they come due in the future, at separate times.
I'm here on an O retirement visa.
@Patcharin *********
is the name of my agent and she's a damn good one!
I'm now on the 65K/mo method... so no more 800K baht, tied-up and not producing any income...