Only thing I could add to the above EXCELLENT advice would be to double check every connection (always did a second jump master check before leaving the plane). Same reason we never relied on just our eyes, we backed up with fingers to verify. Trust but verify! And check your gear.Great topic @redsquirrel
To me, the most important safety advice has nothing to do with gear at all. SLOW DOWN. Be deliberate in your movements. Remember it's not a race. Take your time and double check everything before you climb. Spending an extra 60 seconds on the ground going through your PCCs - Pre-Combat Checks if you're in the Army, Pre-Climb Checks if you're a saddle hunter - and your PCIs - Pre-Combat Inspections if you're in the Army, Pre-Climb Inspections if you're a saddle hunter. Taking 10 minutes to climb slowly and deliberately instead of 7 minutes in a rush will make a world of difference.
I'm one of the guys that likes to push the envelope of lightweight and low bulk. However, everything I do is tested extensively at ground level. I only leave terra firma once I'm confident. When I was learning to climb with spurs, I practiced at 2-5 feet for several weeks before I climbed higher.