It was a relatively painless process, other than the medical. There was a little pain there. (After invite, they load tasks for medical clearance that you have 60 days to complete. My doctor's office was scheduling out 3 months, so I had to go to a completely new doctor in a different office. However, even with a HDHP, my out of pocket costs were less than $100 because most things are preventive and they give a small reimbursement for medical costs. Before my insurance kicked in, the costs were over $1300.)
I applied in late July, received an interview request in early August, was interviewed in early September, and was invited in late September for a position starting mid April. It will be less than 9 months from application to leave date. After invite, I worked on medical and dental, passport and visa, and now it's just a waiting game.
I'm an engineer hired as an English teacher. I'm planning to do science and math fun clubs in basic English as a secondary project to educate the kids (targeting the girls, but including the boys) about STEM. It's a 95% pay cut, but I'm extremely excited to take it on, and afterwards I'll either go full on nomad, apply to the foreign service (embassies), or work in Spain for a year or three as an English assistant.