Caipler (spell?) rebuild question

[vrooom]

Hiya I really like that spinning smiley, look cool. anyway. Im about to do my first caliper rebuild before putting them on my car.

its AP racing 4 pot vented calipers, and i accquired them from scrapyard after i looked around for best condition.

How do i remove those piston and seal without special tools?

and when putting things back, do i oil my piston in clean brake fluid?

and how do u know caliper is scrap or not? Pitting, and other else ? i cant remember what.

THANKS

Jay