Still waiting for the MacBook to arrive, but installing it into my mates it's POP.
Get a coin to remove the batter, then you'll see a slim silver piece of metal, with 3 or 4 tiny screws in, remove them and the metal and you'll see the RAM and HDD to the side.
Pull the levers for the RAM and it pops out, then slot in the new stuff - 5 min job if you're competant, 10 if you're not! lol