Smoke it out of a traditonal porcelin bowled opium pipe. If not use some type of pipe with a bowl that you can kinda indirectly heat the opium more than just putting the flame to it like weed, the old school opium pipes that are still around , I know a guy with one, used some way to get the opium to heat where it would vaporize instead of "smoke" but there is a certain teqnique to doing it like that, which I do not know. If you use a regular pipe for weed,or tobacco over there, put some bud in it,or tobacco if you have not weed, and heat it like weed,although try and keep the flame from hitting it too long, and the weed or tobacco will let the liquid opium that it turns to when heated or liquid like, tar like I guess, the weed will let the resinous opium soak into it and will last longer that way IMO. Start with a small piece and smoke that, then smoke more as needed, I do not know how much exactly would cause an OD, but smoke on a small bit and hold it in ,etc. and hit it kinda slow,do not be in a hurry,let it kick in good and you should feel the effects soon, and you will know if you need a few more hits or not..You said you smoked opium 10 years ago, so you kinda already know what to do,,just take it slow and let it kick in,and don't try to smoke it up quickly and you should be able to adjust your dose from there..