get a bowl and fill it with hot water and place your vial in the bowl for a few minutes. this will make drawing the test into needle easier and it will make injecting smoother as well
i woudent do that ,warter hold a ton a bacteria ,get a blow dryer and heat the vial with it ,it will make the oil nice and thin ,this help with pip in some cases and makes drawing and injecing a damm lot better ,dry heat when it comes to heating vials not warter.