What is the most efficient way to remove old tile from the shower?

I need to redo my bathroom shower because I have discovered 3 tiles at the base of my shower that were loose causing a leak into my basement. The pattern on the tile is no longer available, and is not easy to match as it is a flower pattern. I'm probably going to remove all the tiles to replace with a shower insert. What is the best way to remove the tiles, while hopefully preserving the sheetrock?

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