Dave - I have had pyracanthas for over 40 years with no pruning problems. Simply put the removed forward growing pieces into a container as you go along and wear thorn proof gloves.
It's like everything in gardening, a bit of effort is required if you want something.
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The two I inherited were overgrown, unruly so-and-so's and I think the experience of trying to get them back in check has put me off for life Joyce
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Not surprised Dave !! I planted mine so was in control from the start.