Use a 1ml syringe. This has proper dosage markers. I'm assuming you are taking somewhere between 0.075ml to 0.2ml a week. Draw with no bigger than a 20gag needle. 22 to 25 works well. I like to inject with a 29 to 31 needle but at 31 you need to really push the plunger down fairly hard. But at 29 i don't really feel the needle go in much. Thats a big bonus.

Remember to use new needles and syringe every time. Also swap needles from draw to injection to stop a painful injection. Just pushing a needle into the rubber top will bend the tiny tip enough you'll feel it. Try to poke the vial in a different spot each time. You can often see previous poke points. I like to go in a spiral around the edge. This helps to prevent leaks and helps prevent rubber becoming lodged in the draw needle.

Side not, alcohol swab the vial top before draw and swab the injection location before you poke yourself. This is just good sterile hygiene.