Now you can understand why a proper service change can take a week to do!
There's more to a service change than going to the home center, buying a panel, then replacing the fuse box. Too often, each (overfused) circuit has to be replaced by three breakers, or more. I have seen homes that had all the 110 off one fuse, and all the 220 (stove, dryer, water heater) from another pair.

I try to break off all the obvious dedicated loads- furnace, a/c, fridge, etc. Nevertheless, I often find myself called back to further separate circuits. Those 15 amp breakers are obviously not as 'good' as the old 30 amp fuses!

What is beginning to alarm me are the self-appointed "experts" who want you to see just how easy it is to replace a breaker!