i need a help for iphone3g

[nany]

hello all members i buy an iphone 3g and i want to jailbreak it because i'm a newbie in this domain but i fear to advance (shortage of experience) and i have read so many post in the web for many software wich can do it(blackrain,redsnow...) finaly i 'm very confuse !!!!!!
i dont know what is the soft for make it ,i need someone who can give me more details.
i post the information for my iphone
firmware: 3.1.2(7d11)
model: mb496nf
prog modem: 05.11.07

please explain me what the best soft for to do it without risk thanks in advance for your reply

[teerak2uk]

blackrain will do it

[leith]

yes and after you have to use cydia and download ultrasnow to remove simlock