Interesting. I've talked to a good number of people who have used thi gear. For many, there is no pain issue at all. I used it 1cc mixed with 1cc EQ and got no pain at all. I have talked to an unlucky few, that have had plain. I would try 1 to 1 for starters. I'd draw up 1cc of you test400 and 1cc of sterile oil, into the same barrel. Then I would apply a little heat with a hair drier, to make sure that it mixes completely. Just make sure it isn't super hot when you go to inject. You dont want to burn yourself from the inside! Inject into qlutes and maybe quads to start. Stay away from small groupls like delts, tri's bi's. To see how you respond to this mix, I'd do .5cc each, total of 1cc for your first shot, so you can see how much pain this causes. If needed, you can mix in even a higher % of sterile oil or another type of gear, that you know to be nonpainful for you.