For most of history, it probably was not easier, although there seems to have been a relatively brief window where access to potent drugs and poisons made things quite easy to ctb if someone wanted to. For example, the morbidly depressed Rudolf Wittgenstein (Ludwig's brother) went to a bar in Berlin and ordered a glass of milk, into which he casually poured a lethal dose of cyanide. He died shortly after. Honestly, if I had easy access to cyanide like that, I'm not sure I'd be here.