>>5 That hadn't even crossed my mind, should have mentioned that as well. A7x is one of those hard-to-learn-on bands. If you're brand new to playing, you should start a little slower.
Some System of a Down songs were good for me to learn on, like "Lonely Day" for instance, that was easy for me to learn the Bass Guitar on. Not too sure about Guitar, but look into it.
Another good starter would be "Brain Stew" by Greenday. Pretty basic, gets you familiar with chords and chokes inside of some Tabs you might find while you're learning.
And yeah, make sure the other guy knows you are new. I remember learning to play, and some friends invited me to come play in a little freeform band with them... I was terrible, but fortunately they were tolerant and helped me learn a lot.