Ill weigh in.
If you connect to sewer REPLACE IT, I think the drain ideas are silly honestly. If you are on septic, replace with a drain. You should have never had a disposal anyway with septic system...
As far as electrical, It shouldn't be intimidating, but no shame if you call someone. With a disposal were talking maybe 3 wires and some wire nuts in a juntion box? Turn off the breaker and also turn off the switch to the disposal. ( VERIFY POWER IS OFF, I cant stress this enough. Stuff is often labeled wrong..)
Good Luck!
ALSO if you do change the disposal, please dont forget to remove the plastic cap where the dishwasher drain hose connects. So many people forget then cant figure out why the dishwasher wont drain....