First unplug your current garbage disposal, then assess what tools you’ll need to remove the pipes.
Plastic slip nuts can be turned by hand, but steel requires a pair of slip joint pliers.
A plastic tub to catch water and a few rags are also useful.
Next, begin disconnecting the plumbing lines from the disposal.
Then using a screwdriver you could remove the old mounting bracket and attach the new one.
How to Remove and Install a Garbage Disposal| winimow (YouTube)