Removal:
Some just peel the top 2 rings off by hand the same as removing the oil rings.
Older rings were notorious for breaking when one end was spread too far vertically.
This still can happen on modern rings but they can be carefully wound on / off by hand.

A piston ring spreader is used below.
The ring spreader hooks both ends of the ring and spreads it apart making the inside diameter wider than the piston.
Then you simply center the widened ring around the piston and lift it up and off.

Caution: only spread the ring just enough to remove / install the ring.

The oil rings are usually removed by hand.