It can be a problem for you, to do drive in Iran if you are not well aware about the culture of Iranian driving. Many tourists of Iran return with full of praise for the driving skills of the Iranian drivers.
The positive aspect of driving in Iran is that the road condition is extremely good. Driving signs in Iran are also very good and Farsi script is generally accompanied by the English Script as well as around Iran even a sign-post in a village.
If you have a tour to Iran and want to hire a personal car, it will very expensive. It is recommended that you either use public transport whilst you are there or, that you hire a driver/use a taxi. It is very safe way to do drive because the drivers are well aware about their country’ laws and rules. You can get confuse if you are driving by yourself, because the translation of the roads may be different from the map and the further confusion whereby some cities have more than one name.