So as if sizing climbing shoes isn't hard enough, it is getting hot and the problem gets bigger!
Secret Stuff is effective for lots of chalk use, use all the secrets of climbing and use them well. The end result is did you clip the chains and have a good time!
Right nitty gritty time. Shoes have got better recently, they have got very very good! Thats good news. There is no bad news. There is a problem though, climbing shoes pinch, hurt, or are trouble some to some degree. Again the good news is that this problem is almost gone if you climb lower grades. If you start edging or toeing harder grades you enter the twilight zone of differing degrees of discomfort. The modern thought is that shoes are so good that it has almost disappeared-well. Discomfort is dependent on a number of things, mainly you fitting in to that tight shoe brilliant climb harder shoe.
Edge rubber, brill in that it gives good support and better edging and will last longer but it won't stretch as much-OK.
A soft shoe is the opposite of what beginners choose but could be the answer. Why lots of reasons but mainly it gives and is kinder to your feet.
Width matters! Above are two shoes same size in this case a 41 but different widths, which one do you want to be waiting on a hot day?
Instinct VS from Scarpa is a brill boot which fits my foot really well, and is the perfect fit for me, but I normally choose a shoe with softer rubber, and synch it up tight because I have a foot with special odd places, so I have trouble outside edging. I can also tolerate some pain, so I go with pain. In summer (here it is very hot, 30°C) I like a shoe with a bit more room, and I normally don't climb very hard in the summer anyway.