jackc-
Being suede they will stretch a little bit. More like mold to your foot slightly but the rubber rand won't so if they're agonising then try half size up. Just bear in mind that the Helix is a flat shoe designed to be comfortable wearing for a long time. Being a beginner that's important, you don't need them to be crazy tight at the grades you're climbing. When you eventually move on to more technical/downturned shoes with tighter/performance fit it would be nice if your Helix' remain your most comfortable pair so that you can wear them on multipitch climbs, easier trad stuff and or hanging out with friends. So try to fit them with that in mind.
If there are any particular spots where there is a lot of pressure when you weight the foot and it actually hurts then again try half sizing up or even a different shoe. Everyone's feet are different which is why there are so many models to accommodate them. Some just won't fit your foot. This is why it is important to go to shops, take your time and try everything on.
The snug fit of climbing shoes definitely takes some getting used to. But the myth that they should be painfully tight is just that, a myth.
I would add that if you just boulder then it's worth getting some soft-ish shoes earlier than if you were trad or sport climbing. The helix is relatively stiff for big indoor footholds. Soft shoes will give you more sensitivity, making you more mindful of your foot placement so your footwork will improve much more quickly. It will feel better smearing on slab and you will trust your feet more, especially on steep angles, if they are stickier. But do avoid very aggressive downturns and high asymmetry at this point.
Buying new climbing shoes is the bane of my life!
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mancub
They do need to be tight but hard to know whether they are too tight and bad, or just tight enough. You should not have any empty space at the front though, that's for sure, and they should be tight enough that you can use the tip on the wall.
They won't stretch loads but that depends in part on whether they're full synthetic or leather top