How difficult is it to be a foreign monk in Asia?

I wonder about the practicalities of being a foreign monk in Asia, especially Theravada-majority countries. In particular; About the Visa arrangements, can this at all be handled without much stress by one who doesn't use money? What about the rule of not driving a car or using vehicles, is this a rule that can be kept by one in such a predicament? Anything relevant is of interest.