No punchdown tool needed for putting jack ends on the CAT wire.
You just need to ensure you're putting the wires in the correct order when you push them into the jack.
http://www.ertyu.org/steven_nikkel/ethernetcables.html
That'll help you out. You just need some RJ-45 jack ends and a crimp tool (or some pliers if you're handy). Just strip them , flatten them into the correct wire order, cuts the ends FLAT, slide them into the jack, and crimp the blades in and then the wire lock on the other end. It helps if you have a cable tester. Mine has been ripped off, but they go for about $60-$90 bucks, depending on the type. Helps if your cables are run from one room to another so that you don't have crossed wired (they tell you something is messed up).
Good luck. I redid my house for phone AND cable, but I shouda ran "teh interwebz" cable the same time (phone line is CAT5E in my place, its overkill in case we ever went with DISH network).