fao anybody else wanting to attempt this upgrade: this was only my second computer repair, and was not half as daunting of a task as forums/posters/etc make it out to be. saying that, i probably would have been lost without the
ifixit guide - in which there is a step which requires disconnecting a rather fragile cable that, if even slightly yanked on, can render the momboard kaupt. as other comments have pointed, this step is not really necessary. thanks for help here, i adore this machine and it's nice to keep it ticking for its 20th birthday.