You should always insure international shipments if your carrier does not provide automatic coverage. Some carriers automatically protect your package from loss or damage up to $100 (this value depends on your carrier) of your item's value. If your item is worth more than $100, you may want to purchase additional insurance.

Note: It is very important to make sure your item is appropriately packed. If your item arrives broken due to poor packaging, your carrier may not pay your insurance claim.
You should verify whether or not insurance is offered for your items when choosing a carrier, as personal effects (home computers, bicycles, clothing, electronics, etc.) may not be protected.

All shipments being exported or imported must clear customs to enter the destination country. Specific documentation is required in order to clear customs. Customs is a government agency responsible for regulating shipments entering a country. All shipments being sent to and from a country must clear customs first.

As an eBay seller, you'll need to provide the correct documentation so that your item won't be held indefinitely by customs. Your carrier can easily arrange for customs clearance before you post.

Note : Additional costs may need to be paid by the seller if items have to be returned because they don't clear customs. Also, goods can be held up if your carrier does not arrange for a customs broker in advance. (Most carriers provide this service automatically).