Don’t worry, it’s not complicated at all. A little inconvenient maybe, but that’s always the trade-off when it comes to privacy and security.
Here are the two most convenient ways that I can think of on each OS.
iOS: Bookmark the frontend URL. When you get sent a link, pop open the page and paste the TikTok URL.
Android: Get Firefox and set it as your default browser. Install the LibRedirect add-on (browser extension). Whenever you get sent a URL, just tap it and it’ll automatically get redirected to the privacy-friendly frontend.