I've come across two kinds. The first, bend the sides up.
The second, which IMO are ridiculous, also would have you bend each tread to be horizontal.
To bend the sides up. Make the first bend either with a bending tool or a pair of razor blades. Then flip it around and make the second by holding it with a thin steel ruler and bending with a razor blade.
As for bending the steps...the thing is etched so that the steps can be bent "up" with the ladder face down. One by one using the tip of a #11, then some pretty meticulous work to get the sides bent using a pair of razor blades.
i doubt the above was any help at all.