how do i replace the tappets on a '98' vectra 2.L?

my tappets are going on my motor which is a vauxhall vectra 2.L 16v ls 1998 model. how do i replace them myself as i cant afford $$150-200.
steve, October 2005


done
but the haynes manual for the vectra

dazzor, January 2007
link Click here to see other fixes for Vauxhall Vectra.