I got instate from CU a few years ago. Big pain in the ass but totally worth it considering I only owe 25K in student loans instead of >100K.
I haven't heard of anyone from out of state showing up and paying in-state immediately, you would really have to be clever there. I took a year off, which I think was definitely the easiest way to do it.
And like the earlier post, I feel that the emancipation is really all they care about. You're going to have to work for a year or so in Colorado, and file your own taxes. When you prove that, you're in.
I submitted my application and got a response one day later back in 2008. My application had to be a few hundred pages, bank statements, leases, check stubs, proof of voter registration, vehicle registration, etc. but I swear, they flip right to your tax information to see that you filed as an independent.
I heard somewhere that Colorado provides very little funding to the state universities, which is why we will continue to see increases in tuition. From what I witnessed, most of the out of state kids don't care, their parents write the check and the kid will never owe a dime.
Let me know if you have any questions!