I have size UK8 feet (EU42) and have struggled to buy shoes all my life, because many ranges only go up to a 41 and, even if they do go up to a 42, they are sometimes too narrow, with no option to trade up to a 43. Back in the days when I used to visit shoe shops, sales assistants often said the shoes would soften and become more comfortable over time. Sometimes this worked, especially with leather, after the initial few blisters. These days I buy shoes online and have the same dilemma, though it's not always easy to tell whether the shoes are made of real leather or whether the ubiquitous faux leather will stretch in the same way.
Do you assume shoes wil stretch or expect them to be comfortable from new?