If I've called a passing play...
First I've had to learn to trust my O-line. Normally you have more time than you think to throw. I've had to learn patiences in the pocket, and not panic and throw to my first read.
Also I always leave myself an "out", by having a back running a pattern to the flat. This way if the deeper patterns are covered...I always have an outlet receiver to dump the ball off to. Lastly...I seldom ever pay much attention to the pass rush. I'd rather take a sack than take my eyes off of my receivers, and end up throwing into coverage.
Now I just need to practice what I preach.