Don't worry! The courier will leave a delivery note in your mailbox, as long as they can access it, to inform you they have attempted to deliver your order. If this is not possible, you'll be notified via SMS, email or telephone. Also, when you order is shipped, you will receive an email from the delivery company with a tracking link, via which you will be able to track your order at all times, and make any amendments to your delivery, should you wish to.
If you have any questions with regard to this, you can contact us at email@example.com and we will help you get in touch with the delivery company to arrange your delivery when best suit you.