The tools one needs are freely available on the net and besides it doesn’t take too much time to write your own script to cause the DDos attack.
You need to know though what you’re doing and the methodology required to hide one’s identity is very sophisticated. The ‘best’ one’s hijack others computers usually as part of a bot-net.
In reality though one cannot hide one’s identity indefinitely, which is why he got caught.
Of all the different types of hackers “script kiddies” are one of the most dangerous because they have the tools to do damage and their youthful exhuberance clouds their judgement.
Think of it like a kid owning a machine-gun and using it to do hold-ups.