Switching colleges within UC Berkeley...

So I was recently admitted into the College of Natural Resources at UC Berkeley under the major Molecular Environmental Biology but I realized recently that Integrative Biology over in the College of Letters and Science might have been a better suited major for me.

Is there a long and difficult process that have to got through in order to transfer from one college/major to the other?
I haven’t yet committed to UC Berkeley, nor am I completely certain that I will, but I would nonetheless like to know that if I do commit, I would be able to (not necessarily easily but most definitely do-ably) be able to switch into my desired major.

Thank you for any help you can give…

It is not that difficult to change college if your destination is the College of Letters and Science:
http://ls-advise.berkeley.edu/fp/COCApplication%20Requirements.pdf
Declaring the integrative biology major is described here:
http://ib.berkeley.edu/undergrad/major/declaring.php

great. thank you