The best advise I have ever got was from a Safety Officer, telling me when I was a young tradesman to always lock out any equipment that your working on. It seems a simple and obvious but you would be surprised how easy thinks can escalate out of control if this practice is not followed.
When people get under pressure they start to take short cuts. I have seen it many times and have even been tempted myself. Not just on the big jobs but even at a domestic house. I have seem someone turn a circuit off then disappear to work on something then somebody else appears wondering why there lights don't work and turns it on. The bigger jobs are worse though, I suppose the more people on site the more that can go wrong. Maintenance and production teams have different agendas and communications can be misunderstood.
The photo above was a big job I was running. I had to isolate two big production lines then make sure everyone working in the area had there personnel locks on the two group isolation boxes with the machine isolations keys inside the boxes. Both locking on in the morning and then no one could leave site without taking there lock off in the afternoon was an annoying but very necessary job.
Some more good advise I got was from a triathlon club swim coach. I was training for a full distance iron man event and my swim was very slow. I was near last in my age group most times. Not through lack of effort but mostly poor technic. The hard part is trying to work out how to fix it. That is where the coach came in who kept telling me, I needed to get my arse higher in the water. I tried different things but as soon as I engaged more of my core muscles it changed everything almost instantly. My swim times improved and got me into the middle of my age group as well as making my iron man event way more enjoyable.
Bad advise I got plenty of it all the time at work, people telling me how to to my job even though they have no idea them selves. They were usually they` ones paying or financing the job so I had to listen and at least entertain or try there ideas.