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Everyone feel free to add your own tips... 
1. A automobile screw jack (what you use to change tires with) can hold the heavy disposal while you unscrew off the old one or on with the new.
2. InSinkErator makes an accessory "flexible discharge tube" (cheap, under $10), with four way adjustment to run from the disposal output hole to the P-Trap. 1 rotates, 2. length expands or contracts. 3. twists 4. offsets.
If the new disposal isn't same dimensioned as the old one, the standard rigid discharge tube in the package might not mate up with your pipes. Although usually the under sink pipes, if plastic, can slide up down / in out and so there's a very good chance you won't need this flex tube.
3. My new Badger 5 didn't have the conduit type screw-in clamp which holds the electrical wires tightly to the bottom of the disposal case (for fire safety!). Luckily the old disposal was also an In Sink Erator and so I used the old clamp. Also there were no new plastic wire nuts to join the wires, I used the ones which were inside the old disposal.
Otherwise I would have to have gone to the store's elec supply aisle and fiound a conduit clamp the right size and wire nuts exactly the right size, and electrical tape to wrap around the wire nuts. Either that or buy the alternate InSinkErator packaging which has the cord pre-installed (read the outside of the box to see which type you are buying, cord or no cord).
But I think the pre-wired cord would not have the male 3 prong plug attached, (but only bare wires at one end because sometimes it wires to a switch instead of an outlet box). I would have to have found that elec aisle anyhoo for to buy a plug ;(.
4) InSinkErator's have a fitting on the bottom where a standard wrench fits to manually rotate the blades to clear a jam quickly. Most other brands don't.
1. A automobile screw jack (what you use to change tires with) can hold the heavy disposal while you unscrew off the old one or on with the new.
2. InSinkErator makes an accessory "flexible discharge tube" (cheap, under $10), with four way adjustment to run from the disposal output hole to the P-Trap. 1 rotates, 2. length expands or contracts. 3. twists 4. offsets.
If the new disposal isn't same dimensioned as the old one, the standard rigid discharge tube in the package might not mate up with your pipes. Although usually the under sink pipes, if plastic, can slide up down / in out and so there's a very good chance you won't need this flex tube.
3. My new Badger 5 didn't have the conduit type screw-in clamp which holds the electrical wires tightly to the bottom of the disposal case (for fire safety!). Luckily the old disposal was also an In Sink Erator and so I used the old clamp. Also there were no new plastic wire nuts to join the wires, I used the ones which were inside the old disposal.
Otherwise I would have to have gone to the store's elec supply aisle and fiound a conduit clamp the right size and wire nuts exactly the right size, and electrical tape to wrap around the wire nuts. Either that or buy the alternate InSinkErator packaging which has the cord pre-installed (read the outside of the box to see which type you are buying, cord or no cord).
But I think the pre-wired cord would not have the male 3 prong plug attached, (but only bare wires at one end because sometimes it wires to a switch instead of an outlet box). I would have to have found that elec aisle anyhoo for to buy a plug ;(.
4) InSinkErator's have a fitting on the bottom where a standard wrench fits to manually rotate the blades to clear a jam quickly. Most other brands don't.
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