NO prob bro,
This is called aspirating.
But what Im gonna do is run through the whole injection routine for you cuz your a first timer.
Run your tap water as hot as you can.
Put a few inches of that hot tap water in the sink.
Put your vials in the sink of hot tap water but not over the shoulder part of the vial.
Get your cotton balls and your alcohol and swab the injection site(s) for 15 seconds, do the same with the vials.
Put your loading pin on the syringe, I use an 18 ga.
Fill syringe with compound.
Change to your inject needle, I use 23 to 28 ga.
Get air out of compound in syringe and let a drop or two of oil run down needle for lube.
Insert needle into skin, I go slowly and rotate.
Now to aspirate, put just a little bit of backward pressure on the plunger and you should see an air bubble or you will see blood.
The air bubble is fine no worry. But if you see blood then pull out and re-insert a few mm away in any direction.
I push the juice in as my bod wants to take it.
Pull out quickly.
If you see any blood or blood is running out dont freak out thats ok.
Just use your cotton ball and wipe it up.
Now massage that area firmly and deeply.
Your done and you should not have any pain.
There you go bro.
The aspiration is so that you dont inject your compound into an blood vein. That would not be the best thing to to.