Alex Rider is the main character of the book "Point Blank" by Anthony Horowitz. He is a student that is secretly a member of MI6, a secret agency similar to the CIA. He goes through many challenges in this book. One of the most difficult challenges he must endure is having to change his entire personality and persona which was required for a mission. He was told that he was the only one who do it and that he would have to travel to France. He had to change families, his name, his clothes, his attitude and much more for one mission. Alex is usually very independent and daring but he had to do the exact opposite for this mission. This may have been exceptionally difficult because if he gets out of character in even the slightest of cases it could cause the mission to be a failure and may even cost him his life. Personally I would find this scary and frustrating. Imagine your every move and every sentence is being watched and monitored. Probably the most frustrating things of this mission and even Alex's entire life is not being able to tell anybody about his secret. He has to lie to everyone for the sake of the agency. Honestly I think I would either crack under the pressure or I might accidentally let secrets and classified information slip out of my mouth. Even though Alex did not expect this to be his life, I think he is handling this very maturely and is probably the best person for the job.