Sure.
Is it a good idea?
Well that's debatable, but you might have to with that many plants in that space.
They are going to overgrow it fairly soon
As far as tips on how to prune, I try to prune so the plant looks 'balanced', in this case though you might have to prune back the branches colliding from the plants beside it. I wouldn't prune too much though as sometimes when plants are close, their branches will help support each other. If it was my grow, I would wait a while before doing anything, and then it would be just be pinching off a few leaves here & there.