I have recently finished a scarf made with brioche stitch... it was really deifficul to figure it out and as someone said... you better dont make mistakes... it is really hard to read the threads... I have to undo my work about 6 times!
How I did it...
First cast on loosely an even number of stitches...
row1: *yarn in front slip 1 purlwise; yarn in the back knit1*
row2: *yarn in front slip 1 purlwise; yarn over; knit 2tog*
Repeat row 2 until desired length
After a while you will see it is not so hard... but try no to make mistakes : Þ
There is a website that can be useful:
Brioche is a really beautiful stitch... the effort is totally worth it : Þ