You don't ship books overseas individually. You need a fulfillment partner to warehouse and distribute stock for you. Then you ship the stock to them in one go (saving you tons of money). We print in Lithuania, and have fulfillment partners in the UK and the US, which covers most of the world well enough. Fulfillment companies specialize in this, taking the shipping logistics out of your already too-long list of worries.
If you're doing low quantities and that isn't feasible, then DTRPG has print-on-demand fulfillment centers in the US and the UK.