Could any TN Visa holder tell me some of your experience regarding the following questions:

1. Use exactly the job title as indicated in the DOT, but how about the job descriptions? Just copy and paste from their corresponding descriptions? Please see this page about the description, http://www.grasmick.com/dot.htm

2. What document you used for the proof of previous working experience?

3. What questions did the Visa officer asked?

4. How long is the gap between your Visa date and your position starting date?

Thanks in advance. Your input is greatly appreciated.