I have to admit i jumped in to quick and without thinking it though properly with that statement. I would like to see a less congested city but completely banning cars is not the answer however something needs to be done about the sheer volume of traffic. I work in the heart of Brighton my work...
I do have a lot of sympathy for you, it sounds to me like you just want to work, earn a wage to support you and your family. But if as you say it's almost impossible to find parking spaces, surely that must mean there are just to many cars in the city.
Maybe the answer is to give all tradesman free parking waivers just like window cleaners, sign writers and chimney sweeps get and restrict the times normal cars can drive into the city.