As someone who loves being out'a control and constantly havin' the sh#t scared out'a them, my advice probably should be taken with a grain of exlax, but...
"Desensitizing" is a good answer. Always get onto a run much steeper than you're comfortable with at least once every few days, NOT ONCE OR TWICE A YEAR!. 35 degrees makes many people tremble & quiver... until you start hitting 40 degree slopes. Then suddenly that stiff legged, defensive stance goes away when you go back to the 35 degree pitches. Same with the 40 degree slope when you hit 45 degree pitches enough. Also, start straightlining the bottom section of chutes, higher and higher each time... supressing thoughts, of course, of what your body can reasonably survive if a rag-doll situation might occur.
What's the easiest way to "go for it"? You have to ski with people willing to help push you. A week or so ago I was lucky enough to ski with a group of those extreme helmet-heads who were competeing up at Red in Rossland. Most of them have comfort zones like anyone else but when skiing together they tend to push their zone, a bit to impress their peers but more to desensitize. In turn, their peers will see it can be done and give it a go themselves. That age group (18-25) seems the most open to expanding their zones... and it's contagious! But eventually, I suppose, you'll have to catch yourself and start acting your age........... Naaah!
"Commitment" is the best word I can think of to help push your comfort zone. That saying, "if you see yourself succeeding rather than flailing, you probably will", is hokey and over-used by self-help Guru's but there's some truth to it bolstering your confidence. That 'boost' is the most important thing to handle the fear, but you have to leave doubt at the top of the run. Do... or do not. There is no "try".
and like I said: if you're not scared, you're just not goin' fast enough.