I know that there is this amazing initiative out there called "Lets Encrypt" to enable a lot of sites to become HTTPS.

Quoted from their own website:

"To enable HTTPS on your website, you need to get a certificate (a type of file) from a Certificate Authority (CA). Let’s Encrypt is a CA. In order to get a certificate for your website’s domain from Let’s Encrypt, you have to demonstrate control over the domain. With Let’s Encrypt, you do this using software that uses the ACME protocol, which typically runs on your web host."

If I got things right, they offer a free valid certificate. I know it must probably be expensive for us to enable thsi on our side (even though would give us even more credibility as an official website for the project).

So... I was just wondering if this is doable from our perspective?
Do we have an option to enable this on our side? Is it simple (it never is), is it expensive?

https://letsencrypt.org/