In my experience, anything over like the 50 foot mark is more conditions based than anything else for most of us "average" skiers. Be patient, wait for the right storm cycle. When I drop anyting that size I want to be fully confident that I could land on my head and still be ok. That's a huge peace of mind when you're about to ski off of something huge. Probe the landing, or hike the zone in the summer, so that you know there's nothing in there that will destroy you. Knowledge that the landing is really good is the biggest thing that helps me get in the right mindset to actually ski off of something large.
Learn how to hot-tub. Trying to stomp straight to your feet off a really big hit is a bad idea. Instead, be ready to colapse to your hip as you land. It makes for a softer impact, and also helps you scrub speed, then you can stand back up and claim it.
Other than that, I'm always a little extra carefull when I go off something bigger. Release test boots and bindings regularly, wear a back protector, have a buddy ready if something goes wrong, mouth gaurd is a good idea, don't use your pole straps.
Some folks have the skill to drop big stuff. Others have the snowpack and patience. Start out with the snowpack and the patience, get a feel for it, and grow into the skill.