Visa Stamping from Canada/ Mexico

Hello Friends,

I've been following this forum and it's very helpful. I have my appointment in Vancouver on 8th Nov. This is my first time H1B.

My Situation: I've been working on CPT since last year and OPT before that. While my H1 petition was pending and we replied to the RFE in Aug, I travelled to Canada on Oct 20th, planned to return on Oct 28th, reason for my visit was to collect my Canadian PR card. My H1B petition was approved on 23rd Oct. That means I cannot return to US on F1 stamping and have to get my H1 stamping here in Canada. Below is the list of documents that I’m carrying.
My Questions:
1. Will there be any complication during the interview?
2. What is the best way that I should explain my situation to the interviewer?
3. Apart from the below list should I carry anymore docs?

H1 complete set – I797, letter to embassy from employer
Passport
Visa appointment
Instructions Page
DS160 confirmation page
Photo
COPR Copy – Canada PR

Client letters
Vendor
Employer Letter - Offer Letter
Pay stubs
Client profile & ID Card
Performance evaluation
Approved Time sheets
Resume
2 years W2 and tax return

Education Certificates
I20s
CPT Agreement letters
OPT EAD Card

Lease agreement
Bank statement
Health insurance

DS160 Payment Confirmation
D6160 full
US Return Tkt

Thank you in advance for your feedback and inputs.