there is no such thing as "true to size" and like all boots, they only fit the people whose foot is the shape of their last. go try them on under the guidance of someone who knows how to fit boots, usually a boot-fitter
I usually bring a knife to a gun fight. Sometimes a sharp one.
Go to a good bootfitter. Boots are the single most important piece of equipment you own, it's very worth your time and money to go to a bootfitter. Epicski has a directory of good bootfitters by location.