I've been diving since 1998.
I learned Murphy's Law of diving this year - when you plan to do that deep advanced wreck dive you've never done before, your reg (that was just serviced 10 dives ago) is sure to fail on the shallow reef dive the previous day, forcing you to use rental gear.
Then there will be a ripping current running across the wreck and you will surely be placed on a dive boat with a group of cave diving, rebreather certified members of the media who each have each logged at least 5,000 hrs underwater and will be writing a story about this particular wreck - hopefully not about how you got swept off of it and lost at sea.
No pressure there at all.