most are easy to change

the hard ones are going to be the 2 water sensors at the back of the head behind the inlet

its proberbly easier to remove the inlet manifold to do these

phase sensor is easy

remove dizzy cap, rotor and cover, and then its just 2 screws that hold it in

make a not of which way round the connector goes on the pins though, i dont know the gap you should check it to though i carnt remember, but im sure someone will say what it is

cran sensor is just 2 nuts off the sump and undoing the p clips that hold it on to the sump aswell,

gap i dont know as ive never changed one, but i think they could be a set gap im unsure