It's difficult to generalize when discussing pruning requirements. Not only do many plants require pruning at differing times of the year, most experienced gardeners will have their own opinions based on their experience. In your two cases, though, although I live in the western U.S. and we do not have Laurels, friends in the southern U.S. that do have them tell me to prune any time you wish. They also say that if anyone finds a way of over pruining that will kill the tree to let them know. Apparently it's very hardy and difficult to damage. I would treat it as any other, though in planning removal of branches so as to enhance the visual qualities when it recovers.
As to the conifers... they experience most of their growth in the spring with a quiet period during the warmer months and some growth in the fall. Therefore, follow the time proven maxim of not pruining anything during its maximum new growth period. You could prune the evergreen in the summer months, but I would recommed pruning in the winter or even better, late winter or very early spring before the sap starts upward. Again, plan on visualizing what the tree will look like in a year or two...
Best of luck!