I wouldnt screw with your laptop unless you know exactly what your doing, the simple things like, replacing keyboard, harddrive, ram on them is easy done as is changing the battery, but 9 times outta 10 if something fails like Motherboard, etc, ( where as on a PC ud replace the MB and all's good ) on a laptop unless its in warrently its cheaper to replace the entire laptop.
As for PC building, ive been doing it for years now, its not that its hard, its people just think omg look at all them connections and wires and get put off/confused, aslong as you have that motherboard book there, with all the jumper settings etc, your fine.
On a funny note, the clan i play for online, 1 of the members tried to build his own PC and put the DDR2 ram in the wrong way, any of you who have worked with DDR/DDR2 will know the slot on the ram for DDR2 is closer to the middle of the chipset rather than on the DDR where its way off to 1 side, we are still trying to figure out how he managed to force the ram into the motherboard without breaking it....