Scarpa Instinct VSR sizing

Hello, it's my first time buying climbing shoes and I just wanted some opinions on which size I should go for. From what I ready online and the reccomendation from the Bananafingers sizing guide I should go for the EU38. Street shoe size I'm usually a 7 or an 8 US and my feet are 24cm. The only shoes I have worn for climbing has been scarpa rental shoes but in those I was wearing a size EU40 which made me a bit confused. Is 38EU going to be too small? I can't go try them in a shop and I don't have the funds to buy multiple pairs to try on