Day 1 you will get a Company presentation of QR and Doha, followed by a technical knowledge quiz, etc. This will take the whole morning and be followed by an interview with three company pilots which will last about 90 mins. If you are successful, you will be invited to do the simulator check the following day.
Day 2 Simulator. Quite straight forward and will require basic flying skills like pitch and power.
The whole process is very pleasant, friendly and courteous. Don't even think of not wearing a suit, regardless of OAT.
On your trip back home (in Business Class) you will realize that applying to Qatar Airways is the best decision you've made, career wise.