The final post we ran on the Joomlatools blog series about HTTPS explains how to use Let’s Encrypt on WHM/cPanel.
Many of our customers host their sites on WHM/cPanel. As on Plesk, there is a Let’s Encrypt plugin available to run sites on HTTPS easily.
I published the tutorial on the Joomlatools blog: Secure Joomla with Let’s Encrypt on WHM/cPanel
The post focuses on Joomla but the same steps apply for any site, of course.