Check out the “Let it Snow” Xmas 2020 Group youtube project!”
Not sure about the cecilio - but on the EV I have, the pickup is mounted from the top side - so to change it I would have to (a) open the electronics compartment on the underside, and unplug the lead from the pickup that goes into the electronics assembly (don't know if yours has a plug or is soldered directly, of course), then (b) remove the bridge, carefully lever-out the pickup (assuming they haven't glued it down!) and then extract it and its attached cable. On my EV the cable from the pickup goes through a small hole in the body directly under the bridge and into the electronics compartment.
I would take a wild guess that the Cecilio would be similar....
I seriously recommend not copying my mistakes. D'oh -
Please make your own, different mistakes, and help us all learn :-)