Addendum...
1)For comfort, change the needle between steps 5 and 6, as most modern needles have a fine silicon coating to facilitate entry into muscle mass. This is largely lost when pushed through the bung of a drug bottle. Common practice is to use a largish needle for drawing up the drug, smallish needle for injecting.
2)Point 14- don't remove the needle from the syringe, chuck the whole lot immediately into a sharps bin- minimises the risk of needle-stick injury (assuming you are injecting into another person.)
3)Watch where you are injecting, particularly in the Gluteal area- there are large nerves their that you really don't want to hit...