Poor mans berry trellis

Reading New Zealand fruit books and remembering what I read online, the gist was to cut away canes that had fruited, and to trellis the trailing canes for next year's fruit.  However, one of the books says that generally brambles fruit on 2 year old canes, so how you identify what ones fruited last year I guess is a matter of experience.

I don't have the experience or tools to make a proper trellis, so I've just taken the poor man's approach.  I basically uncovered all the trailing canes out of the surrounding grass, and tied them up the post with garden twine.

Here's the Tasman boysenberries:

And my neglected Brulee boysenberries.  Unfortunately, these were set back when some grazing cattle ate them down to the ground.  Their growth hasn't been spectacular since then.

I need to come up with a simple way of doing more extensive trellising.