Hi,
You can use a mass action to change all the products prices via the menu System>Mass actions. You'll want to use one action "update the values" on the column price_value with the type "operation" and the value : price.price_value*xxx
where xxx is the coefficient you want to use to update your products prices.
For the shipping methods, there is no automated system. So either you edit them one by one, or you run a MySQL query on the hikashop_shipping table elements to do basically the same thing as the mass action system can do on the products.