So, I have 8830 - World Edition. I'll be in Asia and am planning to pickup a local sim card with BB data on it...

What do I have to do to get my BES emails?

Do I have to call my IT?
Or I can do a wired activation myself?

Nah it's your DEVICE that's linked to your BES.

But you MUST make sure that you get an Enterprise Plan on the local sim card, most shops may just try to sell you the consumer plan as it's usually cheaper. Note: BB plans often not available on 'pre-paid' services.

I have access to a post paid BES activated sim... so just plugging it into my 8830 should work rt?

I don't have to do BES activation again?