I’m not sure this needs said or not…I am not the safety police, but I don’t want any of us or our loved ones hurt(so I think no harm to mention)
Only thing I would add is to remember that the loader and 3 pt hold stored energy when they are off the ground.
So be sure of why leaving up and be aware of the implication of stored energy. There are loader cylinder stops you can buy (or make) in case need to be in engine room with loader up.
In the case of a quick attach implement on the front loader…if implement a couple inches off the ground and release the levers, it’s possible the implement could kiss your toes if not careful…same for someone helping if they like to reach in. (Same is true for end of loader arms when release implement…careful where your feet or others are when release levers)
Keep the rubber side down.
I'm in 100% agreement with
that. More to the point, newbies are increasingly neglecting to read owners manual and coming to forums for answers. Owner manuals and shop manuals are written by then proof read, sometimes re-written and proof read before going to press. It's not a cardinal sin when mile pole members fail to clarify safety issues but to bring their oversight to light is often treated worse than cardinal sin. It is for that reason I didn't weigh-in earlier on this discussion even though two near death instances came to mind when I read the question.
My born and raised on a farm uncle killed engine while 3 point plow was in up position then proceeded to replace plow points. My 5 yo cousin climbed onto tractor and moved 3 point leaver trapping her dad beneath plow. Instead of running to her mom for help she hid in shop to cry. Thankfully my aunt eventually heard his calls for help before he suffocated.
My 30 yo brother,also born and raised farming, wrapped a bunch of round bale twine around shredder (bush hog) blades. Being rather large he parked tractor with cutter suspended above a low spot and killed engine then put tractor in gear before going underneath to cut away twine. This tractor was not live pto and twine was binding enough to prevent wheels moving,,,,,,until he freed things up. Tractor rolled back sitting cutter on him until his body resisted tractor moving. Close as they could figure, this happened about an hour before his wife got dinner ready. She waited another half hour before getting truck to drive over to tongue lash him.

Help at last,,,,,,,,,,,NOT. His wife wasn't farm raised and as much pain as he was in, he didn't want her anywhere near that tractor for fear things could quickly become worse. Another 30 minute delay while she went for a neighbor.
For your own safety look at the BIG PICTURE,not just for shortcuts before taking action.