Wow,I appreciate all the replies and input. I suspected this might be pretty involved (replacing the chain, derailleur and/or rear cassette = pretty involved, by my experience) I'll complete this season of riding and see if I still feel the need to change. I guess that I was used to my Cannondale road bike from 30 years ago.
I've learned quite about already from this forum, thanks again for helping to educate me!