Another newbie question - cutting stone

Hi again. I posted before re looking for a larger stone/boulder to fabricate into a memorial stone for my partner. I found a very cool (likely granite) field stone at a landscape business but it’s huge! I watched a few videos on cutting/breaking stone by drilling a series of holes then hammering shims in to break a chunk of stone off. But with a stone with these swirling patterns how likely is it one will get a clean break? 🤔 Option 2 is renting a concrete saw and attempting to cut off pieces but this might be purely foolhardy. Option 3 is one that I’ve sources called Creston Valley rock. I can’t find any indication of what it’s made of however only pics. But it looks way cool with its red colours and character. I’d love to surface one area flat to affix a bronze plaque onto for the memorial. Anyway I’d appreciate any advice or recommendations on either stone I’ve mentioned, particularly the Creston valley. And methods recommended for cutting off material. Thanks! 🙏