I was there for a month ago but I did not go through the regular selection process due to previous experience but I talked with some guys who did it where I was there; not a big deal, just be prepared with some random atpl questions regarding ALL atpl subjects. Psychological tests take a while but nothing really tuff. You will get a kind of compass test also, once again nothing impossible. If you achieve to pass these steps you will go for a ride in the sim (basic fnptII with old clocks I think) and finally an interview with hr/chief pilot etc.
Just be prepared as you should for any interview and I m sure you will make it.
Good luck!!