How were your first days as a System Admin?

Things are still going good for me roughly 2 months into this role. Today I finally got to get familiar with server hardware (HP Proliant DL380 G5s and Dell Poweredge R210 II's). I had to setup the rack kit in the rack and while I had a vague idea of how it's done (looks really simple), it was actually a good lesson.
One of the senior engineers came into the NOC while I was removing the rails for one of the servers to move it into another rack and he asked "what the hell are you doing down there?". He asked because he saw me with a screwdriver and pliers going to work on a tooless rack kit. I was unscrewing the points that connect the rails to the rack (It really looked like that was how it was supposed to be to remove it!!!). So I told him what I was doing and he said "let me see...". He took a look and said "you know, those aren't supposed to come out, there's a little latch on the back that releases the rail.". So he presses the latch and the rails come right off within seconds... I was like WTF and couldn't help but laugh as it was A LOT of work to get those 8 screws out of the rack. It took me like 30 minutes and I was sweating while I was finally almost done hahaha. The NOC is really cold but all the effort I was putting into removing them changed that.
That's a mistake I won't make anymore, HA!
Did any of you guys have any gotcha moments like that one when you were new to System Admin work?
One of the senior engineers came into the NOC while I was removing the rails for one of the servers to move it into another rack and he asked "what the hell are you doing down there?". He asked because he saw me with a screwdriver and pliers going to work on a tooless rack kit. I was unscrewing the points that connect the rails to the rack (It really looked like that was how it was supposed to be to remove it!!!). So I told him what I was doing and he said "let me see...". He took a look and said "you know, those aren't supposed to come out, there's a little latch on the back that releases the rail.". So he presses the latch and the rails come right off within seconds... I was like WTF and couldn't help but laugh as it was A LOT of work to get those 8 screws out of the rack. It took me like 30 minutes and I was sweating while I was finally almost done hahaha. The NOC is really cold but all the effort I was putting into removing them changed that.
That's a mistake I won't make anymore, HA!
Did any of you guys have any gotcha moments like that one when you were new to System Admin work?
Currently reading: Network Warrior, Unix Network Programming by Richard Stevens
Comments
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Don't worry, becoming a sysadmin, in a network where you are actually allowed to learn (and make these little mistakes) is where you need to be. Learning to be a sysadmin is like drinking from the fire hydrant you have to learn so much to be an effective sysadmin. Sit down and talk to a grey-beard one day and listen to their stories from the bad old days, then your learning curve will seem not so bad
Being more experienced comes more politics because you are trying to push changes and decisions... Not as fun.
You may learn something!
None of our systems were documented at all and most of the IT staff had recently been replaces so every time I walked into our datacenter I found equipment running that nobody had the slightest clue as to what it was. To this day I'm still finding things that nobody knew existed or just assumed served some purpose.