/diy/ - Do It Yourself

My cat died a few days ago. He's buried now but he was such a good cat that I want to make a decent tombstone for him. I have carved things into stones before with a hammer and nail but that takes forever and the nail gets blunt and digs into my fingers. This time I'd like to get the proper tools for it and use a 100lbs sandstone slab from a creek somewhere. I don't want to do epic calligraphic fonts or designs because it's sandstone, that will just erode in 50 years.

What tools would I need to carve stuff onto a sandstone slab?
Are there tools for chipping the sides of this slab off to make it have a better shape?
Has anyone else here done stuff like this before?