When I first started (indoor) bouldering, I wasn't quite sure if I was ready to commit to it, so I went and bought a pair of shoes in the sale that were relatively cheap (or at least cheaper than continually renting from the centre). I bought these in my street size (UK 11) rather than a smaller size.
They were perfect (and still are) for the problems my centre sets between V0-V2, however, I'm struggling with V3. I'm not sure if it's down to having street sized shoes which don't curl my toes (though are snug) the same way a 10 or a 10 and a 1/2 would. I mainly have problems getting good strong holds on smaller footholds where just the edge of the shoe should be on the hold. Now this may be just my terrible footwork, but I'm also wondering if shoe size comes into play at all.
How should I choose the proper size of my climbing shoes?