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First thing you need to do is find the set screw that releases the inside handle. then you pry off the escutcheon plate (trim plate). the two screws you are looking for are under the trim plate.

I've done it and you don't need the original key or a SmartKey. Disassemble it right down to the core. There will be two slip rings that can be pushed off with a flat blade screwdriver to allow you to get the core apart. Gently slide the outer cylinder off the inner core, remove the little bar in the center of the inner core and then lift off the ...

This style lockset is known as a mortise lockset. Dis-assembly and cleaning won't hurt. While you've got it apart, print the Baldwin diagram below, and note your dimensional differences. Some will be critical (holes for knob and deadbolt), others may be compensated for by strike plate adjustment or wooden block supports (under a shorter mortise ...

If it is just the key that has problems it is highly unlikely that you need to replace the whole knob, latch and lock set assembly. The lock cylinder itself is really likely to be a separate sub assembly that you can replace. From looking at your pictures it appears that the removal of the lock assembly is as simple as taking out the screws in this ...

The first thing I would try is lubricating the lock with some graphite. If it doesn't help you can remove the entire lockset. Bring it to a locksmith and see if it can be repaired. I would call first and set up an appoiintment to minimize the time you don't have a lock.