The TutsPlus.com site has posted a tutorial for the WordPress users out there about using Let's Encrypt and SSL certificates to easily secure your installation.

For years, purchasing, renewing, installing and managing SSL certificates overwhelmed me with expense and complexity. Now, Let's Encrypt makes it fairly simple and free.

Let’s Encrypt is an emerging, free, automated, and open certificate authority brought to you by a California public benefit corporation called the Internet Security Research Group—it also has nonprofit status. [...] In this tutorial, I'll walk you through installing Let's Encrypt on a few of my websites, including my WordPress consulting website, http://lookahead.io, soon to be https://.

You'll need a be a bit comfortable working at the command line to use the Let's Encrypt client, but they walk you through each step of the process explaining everything along the way. They start with a basic list of features the Let's Encrypt service provides and the requirements you'll need to get started. Screenshots of the setup wizard are included and the "one small difference" you'll need to make when using it with WordPress. They link to the SSL Labs site to help you verify the certificate is working as expected and finish with setting up the auto-renewal of the certificate via a simple cron job.