Going for TN Tuesday Aug 16, any last minute advise?

Hello Guys,

I'm going for my TN next Tues at Edmonton International Airport, and wondering if anyone has any last minute advise for me. I'm putting my documents together as I write, and wondering if there's anything am missing out on. I have a PhD in Biochemistry from a Canadian University, and got a job offer as a Chemist in USA. I know I need a TN letter and/or degree certificate, transcripts. Do I need an offer letter (addressed to me) from US company, resume, letter from previous employer verifying experience and endless professional reference letters and perhaps pay stubs?

Second, I have no family, ties back to Canada....will this be a problem for the Trade officers?

My flight is at 12:53pm, can I get there at 8am? Will airline allow me to check in at that time? If my TN is not approved, can I fix the shortfall and return to the airport same day to reapply and maybe catch my flight to avoid ridiculous airline change fees?

Thanks in advance.