Unplug any cables from your Steam Deck OLED.

Turn on your Steam Deck and allow the battery to discharge below 5%, as a charged lithium-ion polymer battery can be dangerous if accidentally punctured.

Put your Steam Deck OLED into battery storage mode within the BIOS. Read how to do that here.

If you have a microSD card installed, make sure to remove it before opening the Steam Deck. If you attempt to remove the back cover with it still installed, it could snap right in half.

Pro tip: it can be helpful to lay your Steam Deck OLED screen-side-down in its case if you find it wobbles around during your repair.