Raspberries

I pruned my raspberries when they had finished fruiting last year. I cut out all the old wood and left the new growth. The new canes are now six foot tall, should I prune these back now?

Oh!....good  job I asked, thanks!   I'm having trouble coming to grips with fruit pruning. I have several fruit trees but no idea how to prune them. I look at books and think I've got the idea but my tree looks nothing like the one in the book.
I did think about a pruning course but they are not cheap and I fear I may have forgotten it all by the time I got home.

Have you got training wires, if yes, you can bend the tops along the wire, all in the same direction if you see what i mean

Or, bend each over tall raspberry cane round into a loop and anchor it to its self.

I fear I may have forgotten it all by the time I got home.

yep, thats me

I did a fruit tree pruning course at RHS Rosemoor and i thought i had it sussed until i looked at my trees and was just as indecisive as before.
But the instructor did say that it didn't matter too much what you did, the tree would right its self in time