TweetImmediatly after injection? It does depend on the compound and how it was made. I have made homebrew tren that was painless, and have also tried someone elses tren, and felt like I was injecting liquid fire.
Best suggestions to make it a better time are as follows:
Shoot right after your whower or bath when the muscles are warm, it makes it easier
Heat the oil on the syringe by holding it unher hot tap water for a minute
Massage the area completely after injection.
That will help. With some gear, it will just plain hurt, but doing the above steps will help alieviate some of that.