Yes, you can always send your self a test invoice to see how it will look to your customer. 

1. Create and send an invoice as you would normally. Click here to see how to do this.
2. On the 'Email Preview' screen, click on the 'Send a test email' link.
3. An email along with the specific invoice will be sent to your linked email account (NOT YOUR CUSTOMERS).

This is a great way to double check your happy with an invoice before sending it.