I didn't know dick about AM when I started in March. I was referred to this site by my gf's brother and spent a lot of time reading, registering stupid domains, and learning. I also started writing content which has helped a lot to pay for domains, hosting, monsters, etc.
I agree very much with the common consensus of the guys here that are actually banking that the money you make is a direct result of the work you put into your business. My friends may not understand what I do, but they know I hang out in my underwear all day and still manage to get my bills paid. Once you make a little headway in this game you'll see the potential and it will only inspire you to work harder.
It's easy to let your doubts and general negativity get the best of you when you lose money. I've lost money on plenty of PPC campaigns, but I have one right now that's on average giving me a 90% ROI.
Seems like no matter how many times veterans here explain that you need to test, test, test, test some more, and FOLLOW THROUGH, there are still people that don't have the attention span that would rather bitch about their failures.