Tying teh FIG8 starting out is not all that easy on steel.The reason why you get a kink is because you are bending the steel that is through the eye of the hook.
You should make the fig8 fairly tight , make sure not to put tension on the bit through the eye , hook your hook onto something ( not your wifes ears ) slide the f8 up to the eye using your fingers , once it is up to your hook pull it tight , grab the short bit and while pulling the steel going to your swiwel pull on the small piece.
The main thing is dont pull on the steel before the f8 is set up against the eye of the hook.
Once you got is it is very easy.
Very imprtant to tie the knot by applying a lot of pressure as to lock the knot.It is no good sliding up and down your line.
Cheers