I will be the first to admit I am a complete beginner. But I've been doing enough reading that I could "advise" most people who start random 'why aren't i getting bigger' threads along with the average joe - but this would not be from my own experience, just rehashing what i've read. I wouldn't actually know it works.
As a newb I think it's important to be aware of this and look to seek advice from people such as Stu. All the proof to see if somebody is worth listening to is their own physique. You want big arms - speak to a guy with big arms.