Yes, you need to undo the two front sprocket bolts with the special tools fitted. This will allow the sprockets to 'freewheel'.
Only slacken them enough so that the sprockets rotate without tipping/rocking though.
Technically, you are supposed to renew the sprocket bolts but this has to be up to you.
Personally, whenever I do a KV6 belt change, I renew them.
Are you changing the back belts, tensioner, idler & water pump too?
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