Thanks for the encouraging post!
I definitely have bitten off much more than I can chew!
After I posted the comment about PPP, I ran across something in the documentation that PPP was only for serial connections and most cellular modems are treated like ethernet connections. So that direction was a dead end. Thanks for confirming.
I’m an expert at the console now with PuTTY. I think I’ve reset the SG at least 25 times trying to learn. I’m sure I’ll do it 25 more!
I’ll get it someday.