I really screwed up this time

Hello,

So I've been having crashing and heat issues recently so I took off the side panel and opened up my PC for the first time in two years to clean out some dust. Being a noob, I followed a couple tutorials and brazenly removed the fan. Now I find out that it's a cardinal sin to do so without reapplying the thermal paste. I don't have any of that and I'm way too clumsy to do that myself. Does anyone have any recommendations for getting this done professionally? And about how much did it cost? I'm going to call Geeksquad but I have a sinking feeling they won't do it.

I didn't find the right solution from the internet.
References:
https://forums.anandtech.com/threads/i-really-screwed-up-this-time.24539...
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