If you are going to plug your anus with Fina, I would suggest that you DO NOT use an implant gun. This will result in a tad bit of pain; nix that, a WHOLE FUKCIN' lot of pain. LOL!
I cannot get in to exact details of conversion (we used to speak of this regularly, but since things like, “ORD,” that is no longer an option, which is understandable). As one poster stated, the best method is to buy a kit. I will not say where, or how - sorry. From my own personal experience, it was easy and very, very rewarding. Site injection is possible; however, my last run did get tiresome seeing how I had to pin EOD because of its short half-life. Oh well, not that big of deal once you get used to it. But damn, I hate pinning my biceps the most (it sucks!).
The jest of the story: if you try to dissolve it under your tongue - good luck! Plugging such a product is best kept a secret, since it is, well, putting something up your rectum (thought it can be done at a high dose). Like David Hasselhoff's car, KIT is the way to go.