I think he just said that he made the order so we can stop talking about what parts to get. Now you can hop over into the OCing section of the forum and read up on everything involved in it.
Basically yes the guy on the Phone was full of crap. OCing if done correctly is completely safe, gives you a VERY noticeable performance increase, and will give you much better value for your money.
OCing basically is when you go into your BIOS and incrementally tell your computer to run at faster speeds. After each increase you run certain programs (more info in stickies in the OCing section) to test your stability. Once your stability falls you increase the amount of power which regains stability. It is a balance between increasing speed, keeping stability by increasing power, and not overheating. The more juice you add to your system the hotter things will get. So if you increase in small increments, check stability each time, and keep your temperatures under a certain level you are basically guaranteed to greatly increase your computer speed and performance while being virtually 100% safe.
There are tons of stickies etc. that you should read to get some general info on OCing. It seems a little overwhelming at first but it really isn't that bad and there are a TON of people that know everything about everything that you can post questions to on here in the OCing section.
GL, HF, Cheers!