The dosing is very simple. 1/2 cc (or mL) for a standard bird, 1/4 cc for bantams. No need to worry overmuch about the dose. You are unlikely to overdose if you follow that guideline. I like to apply it to the bare areas under their wings where the feathers are quite thin. It needs to be applied to bare skin in order to be effective. When I do my birds it is generally a 3 person job- one to fill syringes, one to hold birds and one to apply it. The person filling syringes is also responsible for my checklist to make sure I am getting each bird and not double dosing any of them. I have it down to a pretty slick science at this point. It used to be much harder when I was trying to do it all by myself, but since I enlisted the rest of the family to help the job goes much quicker and smoother.