If you do heavy pruning in late spring, don't repot until next spring and treat the tree with extra care during the growing season. Shoot trimming is done in the growing season to force ramification. Wiring of pines is probably best done in the late winter. It is more risky to wire any other time, as during the growing season, the cambium is full of sap and is literally floating on the xylem and can be easily damaged, killing the branch. There is, however, a school of thought that says that wiring in the growing season is best, as damage to the branch is more easily repaired.
Black pine is limber in comparison to many trees.
Even large branches can be wired and trained into different shapes if care is taken. Don't wire a weak or otherwise stressed pine. It may be too weak to live through the inevitable damage of wiring. Don't let a wired pine freeze. Depending on where you live, pines can be repotted from December to March.