Il Mio Problema
My left joycon was experiencing really bad controller drift. It started off very minor but eventually it became so bad that I avoided playing certain games until it was fixed.
La Mia Riparazione
The repair went well! I followed the guide available on ifixit and it was easy to follow. Took about half an hour to replace the joystick.
Il Mio Consiglio
Remember to calibrate your joycon after the repair is done!