Technique will also help.
1. Heat up the oil so it disperse better.
2. Use a cold pack on the area to make it numb
3. Clean the area with an alcohol swap
4. Stretch the skin where you are going to inject and keep stretched
5. Put needle in slowly
6. Pull back on syringe puller (VERY hard to do with other hand without needle swaying around...). You should get a bubble, if blood then try repinning
7. Only put max of 1 ml a minute into injection site.
8. As you inject the gear, turn the plunger around so the flow goes different directions.
9. Leave needle in for a minute then take out slowly
10. Swap area again, you may need a tissue for excess blood.
11. Massage the area to stop lumps forming