The problem with many self-repair people is they effectively value their time at zero.
I value my time realistically, i.e. above zero and above minimum wage. It is therefore a no brainer for me to buy AppleCare every ... single ..time. It means I can just drop it off and let someone else deal with messing around.
I also know how much hassle it is. Like many techies, I spent part of my early career repairing people's PCs. Even in big PC tower cases with easy accessibility to all parts its still a fucking horrific waste of time. Hence these days I'm very happy to let some junior at Apple do it for the cost of an AppleCare contract.