But now I much prefer the needle nosed pliers, because they are so much easier! And as you pointed out, when the fingers feel weak because the stem is hard, a stem break can result, but with the pliers it just safely crushes them appropriately before folding (and not breaking) is carried out.
In application; I just slowly apply a 'squeeze' with the pliers to the area of the stem I want to supercrop, and then I just feel for the resulting 'give' when the pressure is sufficient. I normally then move the pliers slightly up or down and apply a second squeeze until I again feel the 'give', then I usually gently gently fold the stem to where I want it. Occasionally, when I go to fold the stem it may feel like it needs a bit more of a crush to 'make the fold' so I redo the squeezing and refold. Easy peasy.