That would depend on your soldering skills. If you aren't confident in your ability to solder, then no, it will not be easy.
simpleton
no
Some capacitors have terminals as they are polarized but some have not as they are not polarized. you can easily identify a polarized capacitor as it has + or - terminal indication marked.
Buy a new motherboard and replace the old by the PC engineer that fixed the same PC unit.
Not much. Motherboards are tightly integrated, and you can't really upgrade the built-in components; that's what expansion slots are for. If you possess sufficient soldering skills, you may be able to replace bad components like capacitors.
In order to upgrade SDRAM with DDR, you will need to replace your motherboard. DDR uses a different slot than SDRAM, so if your motherboard is using SDRAM currently, you will most likely have to replace your motherboard in order to make your system support DDR.
Yes, it is possible to replace your motherboard with new one. Just make sure that your new motherboard fits in your computer, and that it support all of the hardware you had on your old motherboard.
No. You would need to replace the entire motherboard.
No, a processor is not fixed to the motherboard. Most modern processors are designed to be easily removable and replaceable using a socket on the motherboard. This allows for easy upgrades or replacements without replacing the entire motherboard.
ATX motherboards are best suited to providing legacy slots and ports (such as PCI).
NO both were indipendent
$200