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Start by disconnecting ALL wires from the engine to any and all killswitches, and see if spark is restored. If so, find the short, and restore the safety functions. Contrary to what lots of folks think, a little rust on the magnets, or coil poleshoes has NO effect on spark, unless it is built up to the point contact is being made between the magnets and polepieces. The fact that it died all at once is another clue the rust isn't the problem.
An impact wrench is GREAT for getting the flywheel nut loose. Otherwise, take a length of cotton rope, and thread it down into the spark plug hole, letting the end hang out for removal. When the piston comes up, the wad of rope will safely stop it's motion, so you can wrench the nut loose. Is this a Briggs? If so, it may already have Magnetron ignition, and NO points under the flywheel. If it HAS points, it can be converted to electronic by snapping a module into the coil, and wiring it up, eliminating the need to even pull the flywheel, as the points can be abandoned in place. OR, you can get a new coil (which Briggs, in their wisdom calls an "armature") with EI built in.
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