Trim prickly pear pads or cholla stems using a long-handled pruning saw or loppers. The long-handled saw will allow you to keep a safe distance from the plant parts. Trim only where the cactus has a natural joint. Cut away only those parts that absolutely need to be removed.
Deposit trimmings in the trash can using a pitchfork or shovel. Do this as soon as possible after pruning so that no one accidentally steps on the pieces. Do not toss or throw the pruned sections in the trash, since that could produce a shower of tiny needles. Never dump cactus trimmings in desert washes or elsewhere.
Rake together cut pieces that are too small to pick up using the pitchfork. Scoop them up with the flat shovel and gently deposit them in the trash can. Small parts, especially from cholla, tend to latch on to your shoes, clothes and skin. They can be hard (and potentially painful) to remove.