It's not stressful to pull a gpu apart, all you will be removing is the heat sink, how is that stressful? I've repaired two GPUs before with a pressing iron and it worked, the gpus still working due to high temp and I use the iron to sit the chip back in place, there are some videos on youtube about it
Taking a GPU apart is not difficult but it’s a bad design where you need to separate the heat sink from PCB just to change out a fan. Fans commonly go bad and on some GPUs only way to replace the fan is you need to pull the heat sink assembly off.
Pulling heatsink assembly can cause issues. One of them is that the thermal pads usually rip. They commonly cover the memory chips and maybe some MOSFETs. So if they rip what do you do? You need to find a replacement somewhere and they are hard to locate. I had to over from like 3 different sellers until I got the correct thermal pad that would fit.
Second is that if the GPU is really old then it’s hard to separate from heatsink. So you pull and pull to get it off and usually break some solder balls in the process. Then when cold your GPU won’t work.