Determine whether the case will chamber in the intended rifle. If not full length resizing is needed.
If the primer is worth keeping you can pull the depriming pin. (For that matter, you can use a "body" die to resize loaded rounds.)
You'll peel the copper jacket if the neck's too tight.
(Factory Crimped cases are always too tight.)
Neck sizing is easy, no mess. But you need the neck size die.
Jerry rigger's approach...push a tapered round drift punch into the case mouth JUST enough to bell it SLIGHTLY
so it doesn't scrape the copper jacket, and still fits in the crimping die.