I started using Lets's Enrypt for SSL certificate generation today. Let’s Encrypt is a free, automated, and open certificate authority (CA), run for the public’s benefit. It is a service provided by the Internet Security Research Group (ISRG).
I had this on my TODO list since a long time but I didn't liked the ACME implementations available in Gentoo Linux. Today I found the nice project acme.sh which made it very easy for me to get things running. acme.sh is an implentation of the ACME client protocol written in pure Shell language. Just follow the instructions on acme.sh's Wiki Page and I believe you don't need more documentation...
I am testing things now for some days and when everything is working as expected I will write a short manual on how I did my setup. I really recommend to take a look at acme.sh if you want to make all your websites available via SSL. This site is from now on forwarding all HTTP requests to HTTPS.
I am very happy... :)