Do not worry. You will find (your way) easy! We emphasize on buying a SIM card as soon as your arrival in the airport. If you have purchased services like visa or shipping from an Iranian travel agency or website, take them a mobile phone number and ask them to help you on the phone in case of having problem in Iran. Usually this does not cost and they accept. With a mobile phone number, you can call them every time you get lost. Otherwise, whenever you are lost, try to find a group of happy young people (!) and ask them for help. Young people can usually speak English and they will help you. Moreover, police is a good option. You can call 110 or refer to police station.