While getting SSL and HTTPS up and running on your web host and DNS server may have some challenges, Wyam is designed to make HTTPS support easy from a content perspective. All of the built-in themes use local CSS and JavaScript resources, except for Google Fonts which use the // addressing scheme for automatic HTTP or HTTPS selection.
Most of the links to other sections of your site will be relative and will use whatever HTTP/HTTPS protocol the rest of your site uses. However, some links such as those used in feeds may have a full URL. To make sure these are generated with the HTTPS protocol, just add the following to your configuration file:
Settings[Keys.LinksUseHttps] = true;