Ensure your Kindle Fire HD 8 is completely powered off. Disconnect any cables and remove any external accessories or cases. Place the device on a clean, static-free work surface.

Use a plastic opening tool to gently pry off the back cover. Start at one corner and work your way around the device until the cover is completely detached. Be careful not to damage the clips holding the cover in place.

Locate the battery connector on the motherboard. Use a spudger to gently pry the connector up and disconnect the battery. This step ensures safety by preventing power flow during the screen replacement process.

Use a heat gun or hairdryer on a low setting to heat the edges of the screen. This softens the adhesive, making it easier to remove the screen. Heat each side evenly for about 1-2 minutes. Be cautious not to overheat or damage the device.

Place a suction cup on the screen and gently pull to create a gap. Insert a plastic opening tool into the gap and carefully work around the edges to separate the screen from the device. If necessary, apply more heat to loosen the adhesive. Remove the screen once it is free.

Locate the screen's ribbon cable connected to the motherboard. Use tweezers to gently lift the locking tab on the connector and carefully disconnect the ribbon cable from the motherboard.

Connect the new screen's ribbon cable to the motherboard and secure it by pushing down the locking tab. Align the new screen with the device, ensuring all edges fit snugly.

Apply adhesive strips or double-sided tape around the frame of the device where the screen will sit. Carefully press the new screen into place, ensuring it adheres securely and evenly around all edges.

Reconnect the battery to the motherboard by pressing the connector back into place. Reattach the back cover by aligning it with the device and pressing down until all clips are securely fastened.

Power on the Kindle Fire HD 8 and test the new screen for functionality. Ensure the touch responsiveness and display quality meet your expectations.