How much would it cost to install power steering into a '79 Volvo?

I'm about to buy an old volvo from a private seller and he told me that it might be a little difficult to park the car without power steering.. Is it that different? I'm not a big girl and I'm scared that it might be too hard for me so I just want to know an estimate if i do decide to have one installed.. Please help me!|||Dont buy it, it will be too hard to steer as those cars back then were very heavy, and getting power steering installed would likely cost at least 1k even if you bought all the parts used and had it installed by a pro, that is if you could find them at all