WooCommerce not only makes it easy to bring your store online, it has a whole host of extensions that give you full customization options. If you would like to modify your checkout fields, you should give these WooCommerce extensions a look:
WooCommerce Checkout Field Editor: a handy plugin that lets you add new fields, edit existing ones, and change order. The premium version has text, hidden, text area, label, time picker, and other field types for you to take advantage of.
Flexible Woocommerce Checkout Field Editor: lets you quickly change, add, and delete fields on your checkout page. It lets you set default values for each field and reset them.
Flexible Checkout Fields: has a drag & drop interface for reordering fields. Lets you show/hide fields, make them optional, and add a checkbox, radio button, date, time, color picker, and other fields to your form.
Have you found more sophisticated checkout page editors for WooCommerce? Please share them here.