It used to be a lot easier than is not, unfortunately. Our "obsession" with sleek, thin devices running quad core processors and battery life out the wazoo has the unfortunately required side effect of making things much much harder to self-repair.
The worst repair I ever completed, was replacing the LVDS cable and hinge in a first gen MacBook Air. 60 something screws, and complete disassembly and reassembly. I got it right the first time, through sheer dumb luck rather than skill I believe.
At this point, I don't bother trying to repair anything other than my iMac, and even that is difficult. It's become too difficult, time consuming, and risky for me to try, and I can only see it getting worse.
How do we repair that?