I'm a first year IDS student and this is my way of making it work out for me.
Being patient and open-minded about ideas is probably what would make a good designer... at least that's what I've been doing.
Also, I usually go around class and ask my mates what their inspiration was for their design and sometimes I will be rash and tell them how I feel about their work. I do it not to be rude, but just to give them another perspective.
Look at ideas that don't work first before you look at the ideas that do work.
And some may disagree, but I would take comments personally. Not to a point where it would be negative and I would stop being a designer, but only when people criticise my work. They ARE open to their own opinions, BUT I will question them as to WHY they feel that my design won't work.
Always question people.
And always think to yourself that you're a great designer... with some exceptions. Why? Because being optimistic about your work and knowing that it's great makes you feel even better when you see the finished product.
I don't know exactly how this is related to your topic, Jaewoo.Joo, but this is what I've been doing since I started school.