Fat 4.82 to cfw help!

Hi!

I really need som help because I dont want to brick my kids new ps3.

I have searched and read trough just about The whole psx place but I feel kind a lost..

Could anyone give me a correct step by step how I install cfw and what cfw thats The best?

I have a fat that I have checked is OK to i stall cfw. Right now it is on 4.82 ofw.