Uninstall all apps from your device first?
Can someone please tell me if this needs to be done first? I did not do this. All i did was click on update next to firmware version 1.5.5 is available.
Yes, you should uninstall all apps first as stated in
this article. The update procedure might have changed due to huge amount of different changes. Make sure that you have your recovery seed nearby in case something goes wrong (very unlike).
Then press and hold the left button of the nano ledger while reconnecting it to the usb cable until the bootloader screen appears?
Then what?
Yes, hold the left button while reconnecting the USB cable. Your device should automatically update after that. Follow the instructions from the article linked above.