First I completely agree with tommyboy, always have someone with you. When you inject something there's not way to take it back, and sometimes it's more than you thought it was. Also I think someone said there's a place on this website with instructions, definitely read that. I'm a recovering heroin addict and I wouldn't want to wish it on anyone, but if you're going to do it at least be safe. I don't know where you live but I live in the south and getting needles here can be difficult. There are no needle exchange programs and diabetics are given a card that they show pharmacies so they can be allowed to buy them. I think that it causes more problems by leading to needle sharing but I'll keep my ideals to myself. If it truely is your first time you should start by using the smallest amount possible. There's no way to know what you can handle, which is what makes injecting so dangerous. Also if it's heroin you probably already know that one bag could be strong while the other one is mostly cut. I quit when my ex left town because I didn't have anyone to watch me and I can't stress how important that is, my ex would have died one time had I not been there. So start off small, filter, filter, filter, and watch out for blood clots. Once you get any blood in the mixture it will start clotting soon, once you see tiny little clots; yet again filter, filter, filter. It might also be helpful to do a little research in case someone asks you, you need to know how to reply to certain questions. Like what type diabetes you have, what kind of insulin you use, etc..