READ THE INSTRUCTIONS!
I have noticed, after working with quite a few guys, that a lot of people can excel in their field but struggle with some very simple tasks. I'm talking simple as in opening a bucket! I was working with a new coworker who is a licensed electrician and has worked around high voltage for years. He's a very smart guy but I caught him struggling to get a lid off of an empty pail. I didn't think too much of it but then it happened again this week while training a guy at the Edmonton branch. They both went straight for ripping the lid off the pail. These pails have very easy to follow instructions printed on them showing that you have to remove the seal before opening the pail or you will really make your life difficult. It seems that a lot of guys (hey maybe girls too but I unfortunately never get to work with any!) jump right into things without reading the instructions.
Another example is how often they over-tighten their oil filters, which you know is a huuuge pet peeve of mine! The filters show right on them how to install them and NO TOOLS are necessary! 9 times out of 10 half a minute of reading can save you a major struggle. I always check the data sheet before I head out to my job so I know what I'm getting myself into. If you have to park half a block away from the unit you're working on it's nice to have a cart ready. If it's located outside you'll probably want to grab your jacket. If something seems off it can be a HUGE help to call up the last guy who was there and ask them if they had any issues. I don't understand the need to jump right into something and do it the wrong way and then re-do it after wasting your time. Kind of like asking for directions, checking the manual might be some sort of shot to the male ego but I would rather get a job done right the first time and go rest my little girl ego at home ;)