Review on Upgraded Veanic Replacement Joystick Analog Thumb Stick for Nintendo Switch Joy-Con Controller - Includes Y00, Cross Screwdriver, Pry Tools + 2 Thumbstick Caps by Carol Fowler

I watched a video about disassembling the controller and replacing the analog stick. From start to finish it took no more than 30 minutes. I would recommend using tweezers on some of the internal cables as they can be difficult to reattach, and remember the order of the screws as Nintendo uses different gauges and lengths for any screws you remove. In total you have to loosen 11 screws and disconnect 2-3 cables to get to the analog joystick.