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Overgrown mess.

In a corner of my front garden there is about 4 different shrub/bushes i know 2 are rhododendron. They all have a lot of deadwood because there intertwined. Would i be able to to cut them all back without damaging them too mch
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Picture 4, maybe wait until it's flowered first, it's a Mock Orange shrub, and may need half of shrub pruned hard and the rest lightly shaped after flowering. I'm guessing the 2nd photo is an old Lilac shrub that will need rejuvenating if you want more leaves lower down.
Your last 2 shrubs, you can prune back to shape or prune harder down so you get fresh new growth if you want them shorter or want fresh branches.