It takes some real balance to decide to cut off a leaf or not.
My basic rules are as follows:
*if the leaf is not laying on another leaf causing moisture build-up from transpiration, leave it be.
*if the leaf in question is bocking a potentially large growth site, trim it.
*always thin out under growth to increase air flow and reduce the amount of weak or light deprived foliage.
Doing so will reduce chances for pests and disease to set in while redirecting plant energy to new growth instead of wasting plant energy
on self repair.
*if leaves are covering a bud site in such a way that moisture from transpiration is going directly onto the bud, cut it.
*Otherwise I let them stay. Fan leaves convert light energy into plant energy while also storing mobile and imobile nutrients for vital plant functions.

Lots of good advice on here, read all you can...

Hope this helps...