After a chance researched last night, I found out that I could book my flight online at a cheaper prices, at the time I wants and I can have the airline transfer my luggage through the system without unloading it into the transit airport. What I needs to do, is simply have the two plane tickets and state my intend at the airline counter.
The passport pickup required a fair bit of time than I though. They only use one counter to check and return the passport. I heard the staff said it is because the rest needs to process the applications. A fair enough explanation I suppose.
On the eve of the interview day, I am still rather nervous about it. I hope I will do fine tomorrow. I think I will do fine in the interview... I just hope it will be over with quickly.