You need to read your manual. IME most laptops are virtually nonupgradeable, other than memory and even thats expensive and tricky.
Impossible, generally. The CPUs are often soldered to the mobo, and even if not the case design prohibits heatsink replacement etc.
Forget it. Builtin to hte mobo by and large.
Even more so.
Assumption: the mother of all cockups. Check out the price of laptop RAM and then consider whether its cheaper to buy a new machine...