If your work will be on the field, then do you think you still time for part time? Will you have day off?  Field work means away from the city. Anyhow when you get here in Qatar, taking partime job will be easy, just see how your job and time will let you do it once you arrive here.

"There's nothing we can do to change the past, if it teaches  you a lesson profit from it then, forget it."