I remember it being a real bastard anyhow.
I believe I did it twice;
once laying down in the mud
and the second time I removed the battery tray.
Take your pick,
both took about the same amount of time,
and yes it has to be in the mud.
IIRC I either used a 90degree screw driver,
or a spanner and my fingers...
Deal with your linkages at the same time
if you take your battery tray out.