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1. Try on multiple pairs of sneakers, not just the most popular brand, and do so at the end of the day when your foot is larger.
2. Take with you or wear the same socks that you will be wearing when using the sneaker.
3. Test the stability of the shoe, i.e. bend the shoe in half from front to back. The sneaker should bend at the ball of the foot. The sneaker should not bend in half.
4. Price does not guarantee the right fit or feature that you may need.
Remember that these are basic tips and should not be considered absolute. You should consult your doctor/specialist for specific needs.