Advice about hairpins, crescendos, etc.

Two questions:
First, is there a difference between how notion handles hairpins vs. Cresc./dim. marks?
Second, what's the best way to handle these don't i don't want them starting or ending exactly on a note or rest, for example halfway through a whole note, or at the end of a measure when the next measure starts off with a different dynamic(for instance, a clarinet softens to pp at the end of bar 14 but starts at mf in bar 15)?
First, is there a difference between how notion handles hairpins vs. Cresc./dim. marks?
Second, what's the best way to handle these don't i don't want them starting or ending exactly on a note or rest, for example halfway through a whole note, or at the end of a measure when the next measure starts off with a different dynamic(for instance, a clarinet softens to pp at the end of bar 14 but starts at mf in bar 15)?