Changing link text for inserted media

This is a question that may have been asked a few times, but they were old and were left unanswered. I want to know simplified way of how I can add media from the media library but not have the media’s title be the link text (between the anchor tags). I’d like to say something like “If you’d like to get started, download the PDF now.” The bold text would be the link. It shouldn’t be the PDF’s title, like Get Started Checklist, or whatever the title may be. Is there a simple way to do this, even if it means a plugin? I want to make this super easy for my client to edit her site, but I’m not sure how this is done.