Most of the difficulty lies with the display, which is held on with glue-stickers. It requires a fancy cutter to slice through to remove the display, and a no-jerky-the-display-off approach to remove the cables connecting the display to the logic board. Then the complete removal of the MLB, install the RAM bits, and then reassemble, which requires the installation of a new glue-sticker kit.
The 3rd-party glue-sticker kits are not as strong as Apple's, by the way, and can release when you least expect it, resulting in the display falling out, thus ripping the cables and destroying either the MLB or the display or both!
Even the Apple service part version of the glue-sticker bits must be installed correctly or they, too, can fail.
No, it is not easy. But it is doable. And if you break things while doing it, you get to buy new ones, because the warranty does not cover your tinkering.
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