How to remove Payment, Shipping on Login/Reg Page?

How to remove payment & shipping module on the login/register page ?

When customer is logged in, he anyway can choose payment/shipping method.

You need to change your workflow on the checkout in the configuration in the main tab to something like that:
login_cart,address_shipping_payment_confirm_coupon_cart_status_fields,end

So easy... if you know

Thanks a lot

One more small thing:

How to arrange that "bank transfer" is the top payment plugin/chosen by default and paypal is second and so on ?

In the joomla plugin manager you can order the plugins since the hikashop payment plugins are standard joomla plugins.