Soak it in fabric
softener and water
overnight to help loosen it up if really stiff and nasty. Otherwise Piece of cake. Old 3 strand line is sometimes easier than new since the strands dont want to unravel themselves as much.
As mentioned, old bouble braid can be done if it isnt ancient but can be a pain in the butt, and some people say dont bother. When those spinnaker sheets
pop, they usually seem to go at the eye splice, which tells me that 1 they werent buried enough, and 2 a little whipping would go a long way to back things up. Just my opinion, and I am sure some more experienced people will know better.
I did splicing for people in the keys at 10 bucks a splice for most line including the standard double braid types, and 20 bucks a splice for the more tricky types of line. You would be suprised how many wanted it done.