Advice on downgrading my phone back to stock

[calh22a]

Hi everyone! I'm currently using a sprint mogul unlocked with neuSPL 2.47 with a dcd 3.3.4 rom and a 3.42.50 radio. I want to revert my phone back to stock sprint settings. I've been searching the forum and it seems that all I need is neuSPLTitanrelocker and the stock sprint rom (3.56.651.0). So here are my questions.
1. Do I reflash the stock rom first and then run the relocker? or should I relock first and then flash the rom.
2. When I flash with the stock sprint rom will my radio go back to 3.42.02
3. When I'm flashing the stock rom can I just active sync my phone and run the Sprint Rom file or do I need to use programs like RUU update utility?

Any help is appreciated. Thanks again!