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'Knocking' will mean a lot of making good.
Do you have a decent hammer drill?
Much easier to drill out a series of holes in the mortar
to loosen any complete bricks you can remove.
Half bricks: drill a series of (smallish, say 6mm), holes about 5mm oversize to the air brick,
this should reduce the anount of chiselling you need to do to slide the airbrick into place,
and give give an adequate gap to apply mortar to hold it in place.
mespilus
How hard is it to knock some bricks out of a bin shed wall and replace it with an air brick?