I think I am ready to do this but I'd appreciate any corrections anybody may make, before I tear into the calipers.

My plan is to pump the pistons out with compressed air, using a wood shim to bang them against as they come out. I will keep them in order. Using 600 wet-or-dry sandpaper (under running water) and a fine scotchpad I will scrub the pistons clean and the bores. I'll blow brakeclean through the passages. Put a lot of brake fluid on everything and put the pistons back in with the new seals and rings. I'll use new hard brake lines that connect to the calipers, since I boogered the old fittings taking them out. I will flush out the system and begin using Dot 4 fluid. I won't separate the caliper halves (ever again).

Thanks in advance for any ideas.