While there is a great deal of disagreement among rose experts regarding how and when to prune roses, it is generally agreed that it is better to make a good effort at pruning roses than to let them grow rampant. Pruning roses is good because it encourages new growth and bloom, removes dead wood, improves air circulation, shapes the plant. Prepare by-pass pruners, long-handled loppers, thick gloves. Use clean, sharp tools. Look at the overall plant, but begin pruning from the base of the plant. Prune to open the center of the plant to light and air circulation. Continue reading the tutorial here.
SOURCE:http://www.gardenoholic.com/how-and-when-to-prune-roses-right/