Downgrade help

hi every one
just have question if some one can help me with about Downgrading from 4.30 to 3.55 found a link http://www.ps3hax.net/showthread.php?t=39766 but to complicated for me
and was wondering which hardware (Progskeet NOR ProgSkeet NAND TEENSY++
E3 Flasheris )easy to install and any one have idea where is the best place to buy it thanks in advance