You won't be able to see your Crank Sensor. To find it, put your hand
on the Oil Dipstick Tube. Run your hand down it until you feel where
it enters the Crankcase. Feel forward, towards the front of the engine,
about 2", and you'll feel the single mounting bolt and then the sensor.
The cable from the sensor runs up behind the power steering pump, following
the passenger side of your Cambelt Cover. It runs over the top of the Cambelt
cover, past the Cam sensor (mounted at the top of the Cambelt Cover) and then
connects to a plug near your Alternator.
If you don't have air con then you'll change it fairly easily. If you do, there are various
methods.
I removed the Exhaust Heatshield for better access, and changed it blind, by touch,
with my legs waving in the air.

'Vectrolysis' removed the left hand engine mount and did from underneath..
'Taxi Driver' did his by unbolting the Oil dipstick tube and pulling it out (push fit),
and did his from the top.
If I was doing it again, now that I know that the Dipstick Tube is a push fit, I would
use 'Taxi Driver's' method.
The socket for the Crank Sensor mounting bolt is the same size as the one for removing
the Exhaust Heatshield Bolts. This will save you fishing around, blind, trying to find
the correct size. If you remove the Oil Dipstick Tube, don't forget to block it off
to save dropping your Bolt down it and into the Crankcase!!