i have a Acer Aspire 1690
bought it 2 years ago...been heavily using it as a desktop replacement
Sumtimes have left it open nonstop for 3to4 days.
6 months ago, the fan have been giving me weird noises. like as if there is no oil and it is spinning while hitting sumthing, i opened it and cleaned the fan but
problem still persist. Last week, the sound disappeared and i suspect that the fan may have kaputt!!!

I wanna know whether it is possible to replace it on my own at home. Is there any special expertise required? My laptop have ran out of warranty
I have adequate pc knowledge, but not to overclocking or modding level. Is it gonna cost a lot? Running short on money . Thnx