The stores I buy from have pretty open return policies if the shoes don’t work. Fleet Feet, for example, has like sixty days or something? I ran about fifty miles in a pair from them before I had to admit that they were too tight. They accepted them back and refunded me in full, and when I asked what happens to the pair of shoes, they told me it just gets donated.

This is all a long way of saying that if you can find a shop with a generous return policy then you can expect that their to priority will be to get you in a shoe that works. (Of course this might just be an option in USA.)

If you go to a dedicated running store they’ll typically be very knowledgeable and want to help. If you go to a footlocker or champs style store they are trying to hit their sales goals, there is a difference (though not always true in every case). I would suggest going to a local running store and being clear with your intentions