Travel with spare passport photos to avoid moving up and down looking for someone who can take your passport photos. You may need a passport photo to buy a new SIM card in the area you are visiting, it will also save you a lot of time and money.
It is okay to wear the same pair of jeans a few days in a row. Take half the clothes you think you will need. You will not need as much as you think. Write down a list of essentials, cut it in half, and then only pack that.