Group Interview, they tell you how bad the job is. Listen carefully as they aren't kidding. They literally email you instructions and offered everybody who showed the job as turnover is so high.
I applied in-person. The process took 2 months. I interviewed at US Postal Service (Marietta, OH) in Jan 2017
Interview
You are asked a lot of questions about yourself. Also if you have computer skills. Dress codes are gone over together. What kind of schedule would you be available to work.
It was easy and smooth, just make sure you have a plan on why you would like to work for usps and how you would make a good fit. Be honest and transparent and it will be okay.