injections aren't too difficult, but have your vet show you how to do it--that's really the easiest way to see how it should be administered.

if you use a feeding tube, your vet should be able to supply you with that and a syringe it will fit onto. you can't really put it in the wrong place--it goes straight down the back of their throat. it is easiest if you have one person hold the snake while you gently slide the tube down the snake's throat--if the snake bends its neck sharply you will have to try to straighten it enough that you can get the tube in far enough.

i had to treat a snake once with baytril, and i did give that via injection. the only medicines i have administered via feeding tube were ones to treat internal parasites so you might want to speak with your vet about which methods he feels are best for each medication.