My newby mistake was when I was plowing a pathway around my house in 24" snow in order to get the new boiler into the basement through the bilco doors at the rear of the house. I got stuck, and needed to back uphill. I raised the FEL as high as it could go trying to get more weight on the rear wheels and the plow itself flipped backwards landing on the FEL arms about 2' in front of the steering wheel. The plow weighs 600 lbs and I realized how quickly I could have killed myself had the plow pins or mounts broken.
headed down a hill - did not put it in 4wd (not that it would have mattered) with a load in the bucket. halfway down the hill the rear wheels lifted off the ground a bit and I went for a ride down the hill with gravity in control
I learned that before I got a tractor. In college, in Northern Vermont, I had a Suzuki 250 motorcycle for my primary transportation one winter. I should have known better when it snowed during registration. I soon lost track of the number of times I laid it down and got in the mode that driving meant constantly look for a good place to land.<snip>
I've learned a lot more over the years, but the biggest thing is to stop and think "how can this go bad" before doing anything.
Hey, you are supposed to improve with age and hours!