Generally with climbing shoes you want them mad snug to begin with, just wear them when you're chilling on the couch and they should stretch out with time. If the pain is too intense to stand, I say go up a half size. If you're into SUPER aggressive overhanging bouldering, tight shoes will serve you well, but if you're looking to climb for any period of time or just use these as your swiss army shoe, I would size to something I could stand. Just use your best judgement.