How's it going.Let me read of your question. Give me a minute.
Is this a PC or a laptop?
What's the make and model?
If you give me the model and make as requested I'll tell you were you can get the part and how easy the disassembly procedure is. :)
It would cost around $20 to get a fan online and would take you around 1 hour to dismantle.
You would also need THERMAL paste if you are taking the heat sync off the CPU