Do you have a task to do for a client and is frustrated? Keep reading.
I was working on a postcard design a few months ago. My instructor kept asking for alterations and I got to admit, it can be frustrating when they are not satisfied in the time frame you want them to. This is everyday life unfortunately. We can't get things done smoothly all the time. There are bumps here and there which is inevitable.
So cool down. Accept criticism and feedback. Try your best to satisfy the other party - this is more relevant to a client to designer situation or customer to business situation. It can be tough but look, I was pretty frustrated but now, I am happy because my instructor is satisfied with my final work and I will be compensated well shortly! The hard work and time will be worth it. Patience will get you far.