1. GC interview officer has great power. if he/she sit in front of you, give he/she GREAT respect. follow instructions, bring support documents is VERY important and is part of the respect.
2. never even think about that he/she could not have the power for what ever reason, young, new, younger than your child.....The FACT is he/she sit on the chair in front of you (chairman, chairwoman).
3. carefully read documents send to you from USCIS. follow the instruction.
4. the main idea is the marriage and is not the supporting documents. if you have, just bring with you, if u don't have just say why don't have (upstair one person don't have utility bill. rent include, then bring the lease, tell utility is include)
5. no case/person is perfect. many interview has this or that kind of "interview出的岔子". (Any one here want to share experiences? )
6. just be patient. take some trouble but you still will see the green at the end.