It's the simple stuff that I always screw up. I put on a new fuel filter, buttoned it all up, and it leaked. I replaced the distributor caps and rotors-stripped all the hex screws trying to take them off-so I took a hammer and pulverized them to get the screws out. Worked well, especially if you use a screwdriver as a chisel to get at the rotors.
But on complicated things I do pretty well.

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1992 400E current
1988 300E sold
1973 280C totalled
1973 280SEL never got it running
1971 250C my first love but rusted out