First download the rom and the radio.
First flash the radio
Change the name of the radio to PG05IMG.zip and put it on the root of you SD card, not inside any folder, power your phone off and then power back on while holding volume down. This gets you into hboot, choose update and wait, once it is done reboot.
Next delete the PG05IMG.zip or rename it.
Now to flash the ROM.
Edit:
Some of the terminology I have used may be off but I am typing this out of memory
Boot into recovery, you can either use rom manager to do this or power your phone off then power on while holding volume down (this gets you to hboot) then use the volume buttons to choose recovery. I would suggest using rom manager to boot into recovery just because it is easier.
Once you are in recovery use the volume buttons to choose backup/restore and make a nandroid backup, then go back and clear your cache, once that is done go to advanced and clear dalvik cache and battery stats, finally go back and clear data/factory reset.
Now your phone has no operating system at all you can flash the rom. Choose to install zip from SD card, then select choose zip, now navigate to your download folder and select Das BAMF, then wait.
and wait
and wait
and once it has finished choose to reboot.
Give the phone a little bit to boot (the first boot after a flash is always the longest) and you are off and running.
You can flash the rom before the radio but I would suggest flashing the radio first.