5 week is still too early for your supply to stabilise. On around 8 week your supply will stable as in your body know how much milk and frequency to produce milk.
As for pumping, I dont't think will drop your supply back if you stop pumping coz it a way of removing the milk. The more you remove the milk from your breast, the more you produce.
As for manual pump, that the down side of it. Tk so long and hand so tired. I got an xtra electric pump if you interested let me know. I left my email here you can contact me if you need any help. Coz I understand how it feel when you got so many question to ask but dont't know how.