Hi I found this quite helpful, although not as detailed as one would want....
http://letitbit.net/download/2454.fca2d4367b0cd976bc2a65d55/Mazda_Demio_2_service_manual_manuals4you.ru_.rar.html
on the older Mazda 2's (2003 - 2007) there is a block connector under the seat connecting a sensor in the seatbelt to the electronics. In my case pulling out the connector disabled the tedious "bleep".
On my Mazda 2 (2003 - 2007) you have to nuts on the front-top of the air-filter housing, and then two hidden clips at the bottom-back. The clips are just snap-on-snap-off. Might take a slight-bit of force the first few times.