Depending on the accessability of the swarm, they can be quite easy. A newly swarmed group of bees (not settled and built comb) are usually very mild because they have gorged themselves with honey prior to swarming in an effort to be prepared to produce large quantities of comb in their new location.
Put them 40 feet up a tree, in a wall, etc.... it can be a different ball game.
As far as bees travelling, the general agreement is 3 miles. But remember, honeybees are selective (meaning they only work one type of plant at a time). So even if your apple trees are right next to the hives, if there is a "preferred" plant also in bloom and sufficient quantity, they will ignore your apple trees.