Ok....basic rules of safer injecting then:
1. Always use your OWN fresh, unused, sterile equipment. I've dealt with many people who think their mate is "clean" because he showers every day...unless it's disinfectant he showers in he won't be clean enough. Put it this way..the average human carries over a trillion bacteria on their feet alone. Think about what your hands must pick up every time you touch anything.
2. Ideally use one needle to draw up (a blue is good for this) and another to inject (ie: a green). The reason is simple enough...every time a needle goes through something it bends a little. After a few goes it looks like a fishook. It then rips the skin on the way out making the site sore and leaving more places for bacteria to hide and grow.
3. Wipe the vial with a sterile swab before injecting. Some people warm the vials by rolling in their hands or leaving it in WARM water. This can make the injection easier, cold oil is harder to press through and could result in a higher pressure when coming out of the syringe - that can cut through tissue so best avoided eh? But still wipe the vial before putting the needle through it. And yes that means every time.
4. Wash the injection site - ideally upper right quadrant of the glute (arse) or roughly mid-quad (thigh). When injecting in the glute MAKE SURE it's the upper right quadrant. Imagine your arse cheek is divided into 4 equal squares, the top left, possibly the bottom left and possibly the bottom right could all have the sciatic nerve passing through them. You'll know if you hit it. Severe pain and anyone who says its nothing has never had sciatica. Its like having the inside of your leg set on fire.
5. Push the needle in at right angles to the skin - only IV injections go in at a shallow angle.
6. Pull back on the plunger slightly, this is called aspirating, you're looking to see if there's blood coming through. Ideally for an intramuscular injection there won't be. If there is you may have hit a vein, if a lot of brightly coloured blood comes through it could be an artery..in which case you're in trouble. Chances are its a vein so withdraw - change needle - try again. Assuming it's clear this time, push the plunger in slowly. "Needle in quick - Injection slow". This helps avoid damage to soft tissue and makes it less likely to be sore later...although some steroids may caus ethat anyway in some people. Cypionate seems to be a good candidate for that, as does tren in some people. Everyone's different though.
7. Finally - withdraw the needle, press a swab on the site briefly and dispose of the syringe in a sharps box.
Get your kit from a needle exchange if you're new to injecting and have one nearby...they are truly confidential, can provide excellent advice on injecting at least, and supply everything you need for a full cycle (just equipment wise obviously!) Some even have specialist clinics for AAS users providing blood works etc. That's in the uk, i don't know about other countries...and there aren't many I have to say. But i'm trying to change that
Essentially...someone using AAS is always taking a slight risk because you can't always guarantee the source. If its REAL pharmaceutical gear then it shoudl be fine but some UGL stuff can be - less than perfect shall we say. So since you can't control that aspect, you should at least make sure you control everything else (injecting procedure, diet, training etc etc)
Hope this is of use folks