Hi, Thanks for the guide! I took the Macbook apart and the fan off for the sole purpose of spraying the computer free of dust from the inside. It's easy to dissassemble... as long as you're very organized with the screws. Lifting the tabs near the optical drive was difficult.
However putting it back together was kind of a bugger. The whole keyboard assembly sort of expanded and deformed a little bit, probably because of the heat/cold cycles. I had a hard time with the clips below the optical drive (I actually broke one), and fitting the screws back was a bit difficult. The computer seems to run a bit cooler, about 5 or 7º C below usual when idle.
Nevertheless, I succeeded, and left behind my fear to strip my compute to bare guts. Thank you iFixit.