I'm useless at this too.
Try some of the following. Crushing the contents of the capsules into a bit of his food and watching him eat it, or put it in a bit of Dairylea or Primula.
Some people have the knack down well of just popping a pill or capsule down the hatch but I'm not brave enough!
Also, for this I got my cat the antibiotic injection. We all thought that as best, no stress on her and I would not cause her more problems. Speak to your vet about that to see if its the best solution for your cat.