cmyers wrote:
There may even be a twelve-step program available.

HeyBub,

I'm afraid that I have a fear of twelve-step programs.

Charlie

Well, back to plan one.

About your plan to put a 100-amp breaker in the existing box and feed a
200-Amp box from that:

I suspect pulling 100 Amps through one breaker will melt the stab-on bar.

I'd replace the existing box with a new, 200A one. You won't have to splice
wires either.