You can leave out this steps with disconnecting the two cables.
Without disconnecting the two cables, one can separate the two pieces only 1/2 inch. This is enough to work carefully with the soldering iron and change the battery.
It's a little bit difficult to work with the needle to open the three holes after removing the old battery - but you can do it.
From the reading of the other notes it seems to me easier than to disconnect the two cables
You can leave out this steps with disconnecting the two cables.
Without disconnecting the two cables, one can separate the two pieces only 1/2 inch. This is enough to work carefully with the soldering iron and change the battery.
It's a little bit difficult to work with the needle to open the three holes after removing the old battery - but you can do it.
From the reading of the other notes it seems to me easier than to disconnect the two cables
I changed the battery yesterday and left out the steps 7 - 9. It's not really necessary to seperate front and back completety.
So you can't break the brown tab. :-)