It's okay, I've killed a few too before figuring out what they needed. Managed to kill an Adenium by overwatering it. Definitely killed my first Lithops by overwatering, turns out those have a very strict schedule for water. I also managed to kill a cactus! But now I'm doing a bit better, haven't killed anything in a while and my newest Lithops seem to be doing well. Lots of trial and error is involved, that's for sure.
