Just a heads-up to any newbies to LetsEncrypt (like me). If you are using Plesk Onyx as your hosting control panel, you will be surprised at how good the LetsEncrypt implementation is. In just a few clicks the SSL certificate will be in place, verified and will update automatically.
A big thank you to the LetsEncrypt team for a brilliant product and to Plesk for a great implementation of LetsEncrypt.