I dont think that the first condition to take a job is to be good at it, i think that the first condition is to love whatever you do during your lifetime, personally if i like the place i work in and i like the job, i believe that i can do any job i want, you say that you have to be good at it to take the job ,but how could you be good at it just like that i mean we all have our first-time in everything, you can't just be good at something if you don't make mistakes first, you just have to learn from those mistakes.