If you have developed blisters on the soles of your feet, should or do you pop them?

I have been walking my feet off the past couple days. Not only that but my shoes weren’t suited for that much walking.

On the first day I developed blisters. I assumed it was better to leave them until they popped. In the meantime yesterday I got more appropriate walking shoes.

My blisters have yet to pop and they are quite uncomfortable. Located on the center of the balls of both feet. Knowing that I am going to be on them for the next couple days how should I treat them?