There is a profusion of rock shoes to choose from. At first you are better off going for comfort, rather than performance, although a reasonably tight pair will pay dividends with your footwork. Generally one model of boots will fit better than the others, so don’t go on any recommendations, try on lots of different makes and models until you find the right shoe for you.
Some boots are designed specifically for different types of climbing. A stiff midsole makes for good performance if you are going to climb on edges like slate or volcanic mountain rock. A soft midsole makes for a boot that is suited for smearing on rock like gritstone, sandstone or some type of granite. Many modern boots have a drop toe configuration these are great for steep or pocketed like limestone or bouldering. To start off with you are better getting an all round boot rather than a specialist boot.
Fitting a Rock Shoes
If it is your first pair of rock shoes then spending more than 15 minutes trying on different shoes. As a rule of thumb your big toe should be up against the front of the shoe. Not necessary bent right over but a degree of bending in the toe joint will mean the the toe is more claw like and active when standing on holds.
How tight you by them will depend on how much you climb, what you are trying to climb and how long you have been climbing. As it takes a degree of getting used to the tightness required in a rock shoe. Certainly gone are the days when you should be buying a pair one or two sizes too small.
Once you have found the one you think fits you, then walk round the shop in them for 10 minutes to ensure you can wear them for a short while.
Notes for young climber – having overly tight rock shoes has lead to permanent foot deformity in later life. Children need to be at least 16 before they start cramming there feet into overly tight shoes.