OK, let me see if I can decipher this. Trans out of gear noisy is the throw out bearing most likely. Does it whine IN GEAR? In ALL the gears? That CAN be a bad throw out bearing as well but can also be a clutch or pressure plate. In all my years of driving and working on cars, I have NEVER seen all 4 gears make moise unless the trans was LOW on fluid or out of fluid or had been run out of fluid then had it replaced. SO, unless that has happen or is the case, it is probably the throw out bearing. I am not sure what you are talking about on the bolts on the steering but you probably mean the slop adjustment. Yes that can be too tight but that would make it feel a little too quick off center and probably stiffen up the feel of the steering. I'd get him to redo what he did and back off the adjustment a little or replace the steering gear box.
On the park brake, yes, adjust it till the cable is taught but not so tight it is holding the brake on when it is released. It should engage at about half way thru its throw and be tight enough to hold on a pretty steep hill at full on.