It can be daunting, even for a tech person; but it’s not difficult if you take it step by step. I think the main thing is to ensure that the new card is firmly seated and it’s level with the other cards. Wait for the new bracket to arrive, don’t even try with the old one.The Switch + Network Card finally arrived. I haven't even tried to place the card while the new support arrives. I have connected with the old card that is in slot 2. The Switch does not have any lights, so I don't even know if it is connected to the current. I have executed Fing and the Extreme does not appear, so I have entered in VNC all the IPs that came out in Fing. I don't connect with any. It's downright daunting.
Keep the power cord in and touch the chassis of the Extreme to ground yourself when you start.
Remember you need to restart XDMS after rebooting the Extreme.