Get all of the free tutorials from this site and start with one and go through it SEVERAL TIMES....over and over....when you feel like you get the idea, do the tutorial again...then go to the next..etc..
Everyone gets frustrated. It's not just 3d but anything worthwhile in life.
It's the people that DON'T give up when they feel like giving up that make it in life.
Oh, and learn patience...it takes time...it's ok..you'll get there.
End of Zen lesson for the week...