I didn’t have trouble with the CPU or the cooler. The memory, on the other hand, with the insane insertion force required, was pretty scary.

Hmm odd... Maybe motherboard dependent? I've never felt uncomfortable slotting RAM in.

CPU definitely... The modern video cards that weigh like ten pounds also give me pause. Not because slotting them is hard but because they sag.

I find CPU easy, but the heatsink is absolutely the hardest.

Wasn't saying CPU is hard just nerve wracking as it crunches. Heatsinks are annoying as fuck. The first time I did a CoolerMaster H212 EVO I botched install... Had to pull it off which is a careful exercise in and of itself as you sort of wiggle slide it off the top of the CPU which is glued to it with thermal paste at this point and seated to the motherboard.