^^what he said^^ but i remember reading to draw up the rapid acting first and then the regular acting and never mix anything with the long acting insulins like lantus and such. Honestly if you're not certain about every aspect of what you're doing when it comes to insulin I'd do a lot more research before using it. Personally i dont think insulin is dangerous as long as you go in educated about what you're doing but it can kill you and idiots do die because they we're too lazy to take the time to learn about the risks and proper way to take these things.