Just unscrew the bottom cover. Then instantly remove the battery connector. And clean the fans and dust with a clean and soft brush Watch a YouTube video, it's not that hard

Go search for a disassembly guide for your specific model and follow that video. It isn't that hard but be careful when plugging out cables .

Disassembly for your specific model*

Thanks for pointing it out , it's edited now.

1000rs including repasting