Old clematis pruning

Question from Nikki Griffith

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When I moved her e in 2019 I inherited these two clematis that were overtaking the garden. They had a good prune and for the last two years I have pruned them but they do need a weekly ‘haircut’ to stop them overtaking again. My question is – how hard can I prune them please? Or do I continue with these birds nests of clematis. These photos were taken last Friday.