Depends how old your corsa is.
If it is newer than about 2002 it will be chain timing and you will need a locking kit.
Crank locks through a hole in the bottom of the block with the special tool, while the cams lock using a flat bar (special tool) on their gearbox ends.
if your 16V 1,4 is older than that it is timed by belt. There are no locking tools for this, just line up the crank and cams on the timing marks. You may need to loosen & adjust the cam sprockets.