unlock 3gs 4.3.5...5.16.02

[smiiith]

Hello All, Can someone help me with unlocking/jailbreaking my iphone 3gs with 4.3.5...5.16.02 old bootrom (t-mobile.....i dont not have a mac) I understand about problems associated with upgrading to ipad baseband, but thats about all i understand.....any simple to follow steps or links would be appreciated. I did try to research myself....but I am pretty much clueless when it come to jb/unlocking....I was able to do this in the past but it seems much more difficult now.....thanks again.