I have an newly installed SSL certificate on my website and I am trying to figure out how to make some pages point specifically to https and other point only to http. For example, if someone is on my website browsing my webpages via https, and I only need my testimonials and about us page to be http, is this possible? I know this is possible with hard coding all of the links on the site but I am and already have setup relative links. Is there a way to maybe add a setting in the .htaccess file that will point the server to http when someone trys to visit my testimonials and about us page?
Yes. You can use rewrite rules with regular expressions which match the URLs which are supposed to be secure, and rewrite all access to the https URLs. See the mod_rewrite documentation.
Although your examples are pages which don't need SSL but are being accessed that way anyway, presumably the more serious concern is mixing in pages which need to only be https. It's easiest if you just do one direction, but it's not much more work to do the inverse matches and rewrite as well.