cambelt locking pins on a diesel

Hi,when you lock the fly wheel and the pump pulley thing on a l series when doing the cam belt ,is there anything that isn't locked but should still not b turned or moved when doing the cambelt or else damage will b done,it will be my first time and I'm double skint at the moment and the old belt is well duff,so I'm probably gonna need 2 have a bash myself, but I'm just unsure on if something can move or turn by accident that still isnt locked bcos I've never gone near a cambelt before or its various pulleys and cogs ,but am not to bad with diy fixes usually

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