Message to User:
Capitalize. A forum post is not an instant message to your friend.
I know that if I apply to join a guild that's further progressed I'll end up barking orders and ideas over vent and overstep my boundaries. It'd be hard for me to work up the ladder as well because of my lack of experience - all I know about the game outside of Karazhan is what I read here and on the Nihilum blogs.
you would be surprised at how they would react if you where to speak up. if it is new content for the guild and you have a suggestion that might help say it. or if your group wipes and you know what happened or who caused it, speak up. you just have to be careful when you say it.
just don't go in acting like you own the place and you should be fine.
most guilds have an experience part of there apps. so if you say you are willing to learn then you will be ok.