It‘s a good idea to buy a size too big. You should allow room for a little swelling of the feet. Ideally, buy your heels in the afternoon when your feet have expanded a bit.
To protect your toes and heels from friction, especially in pointed high heels, apply Elastoplast SOS Blisterplaster Small to your toes and Blisterplaster Large to your heels.This will take pressure off the affected areas. Adding padding at the ball of your foot will also reduce discomfort when walking.
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Wobbly steps are not very elegant, and will also put you at risk of ankle injuries.
In heels, much of your weight rests on the balls of your feet, which means that walking requires a whole different technique and motion than you would use while wearing flats. Aim for a heel and ball-toe motion: with the heel and ball hitting the ground at the same time.