Hi.
Removing the sensors was a piece of cake.
It requires, however removing the crossmember that blocks the rear sensor,
that is easily done with a 12mm socket.
The sensors themselves are removed with a 21mm open end wrench
mine was not hard at all to remove but make sure that you have a good grip
with the wrench.
The wires will twist up as you remove the sensors so make sure that you twist up the wires equally before starting into the threads again.
Hope this helps.
Regards
Thomas