Introduction
Remove the access door to replace RAM chips.
Tools
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            Loosen the two Phillips screws securing the access door to your iMac. 
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            Remove the access door. 
 
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                            Conclusion
                          
                          To reassemble your device, follow these instructions in reverse order.
Swapping in a new CPU and an SSD took me about 10 hours. I did take a dinner break and spent another hour rooting around in my garage to find my thermal paste. Still, this procedure can take a long time.
gordonhamachi -
Only a french translation proposal. We use to say “démontage” instead of “installation'“ in that specific case. ;-) (Dismantling)
francis barbier -