It's not too bad. You can pull it off the speedo on the back by pressing the white lock around it and pulling it backwards. But to get it detangled you also need to remove the instrument panel. This is described by Roy in another post, but the trick is to release the screws on the heater panel on the right and then push the instruments forward. It latches in the top and folds over towards the steering wheel column. Release the speedo cable first, so you don't pull it apart - I've done that once
All this involves the famous Murena reverse sitting position with the feet towards the roof and the head under the dash