after driving a 93 d21 pickup with no power steering, and driving a 240sx with a blown pump, youll be fine with steering as you pickup speed it will get easier. not having power steering really isnt bad
as for your radiator watch your temp gauge, i had a leak on the top of my radiator that kept my cooling system from holding pressure, without the pressure the coolant would just boil, even with the temp gauge in the middle of cold - hot, so id be driving around, steam coming out and not over heating, but eventuallt the water would boil out , none the less keep water in it and youll be fine, also if your driving on the expressway that should cool things down more. if you can drop some bars stop leak in, ive heard mixed stories about it, being that this stuff will stop a leak, but then down the road people find their water pumps break....... id also ride with the windows down any the heat turned on full blast, that will keep things cooler.
one more thing that car is a nissan , you cant kill it, after i bought my sr20det i drove my ka to death, running with maybe 1 quart of oil and an empty radiator riding around in the H all day long, through the city,then when it finally did die i felt as if i killed something strong and beautiful
you do the cooking in this house