if you are not experienced in feeding raw, i would recommend waiting till he's like 8-12 months old before switching over completely. Puppies need proper nutrition and are very susceptible to problems if not given correctly.
I would do half raw/half kibble until then. Like just giving a chicken quarter every morning or every other morning.
Plus you need more than liver as organ, like kidneys too. 10% of diet is organ and only half can come from liver as too much is toxic.
so it's 80% muscle, 10% RMB and 10% organ.
and puppies need 10% of body weight a day. I feed Lo all she could eat twice a day until she was 4 months old then 10% body weight until she was a year. then i eased back into giving her 2% of projected adult weight.
oh and i also HIGHLY recommend latex gloves!!!!!!! i hate touching raw meat too, not b/c it grosses me out, I just dont like having to wash all the goop off. Plus i hand fed her b/c i wanted her to learn not to gulp.
NEEDLE PUPPY TEETH! lol