PN will need time.. We will need to train at least 16 crews (2 per sub). That is over 570 men.
Take into account land based engineers, mechanics, support staff, maybe we may need over 1,000 trained men to handle all 8 subs.
Pakistan Navy only has 1,000 men. So a full 3% of our entire navy , possibly more, will be part of operating these machines. They will have to be housed and fed and looked after near the bases.
They will need to be trained on very advanced equipment and weaponry and reach a standard where we can confidently send them out in patrol in the Indian Ocean with US, Iranian, Indian and others lurking around.
This will be now easy or short task....