Default [Q] Evo on MetroPCS

Just a couple of questions, and I'm COMPLETE noob to Android.

The phone is already flashed to Metro PCS, so in order to get everything working on the phone, do I follow these steps?

1. Follow this guide - http://forum.xda-developers.com/show...50#post8395950

2. Install MetroDroid 2.2

Now the phone I received already DOES have Metrodroid installed on the phone, can I still follow the provision guide? Or do have to flash back to stock, and then follow the steps above?

I'm sorry to bother you guys, but I want to do what is best for me and what will work.

Also, I saw a video on youtube.com of someone who got 4G working on their EVO while on MetroPcs, is this really possible or fake?

Here's the video: http://www.youtube.com/watch?v=x_XY9IwWYno