Pruning Mini roses

I have three miniature rose bushes planted side by side in an area of six feet wide by three feet deep. They have many little branches and I believe it need to be trimmed/pruned. How do I go about pruning it.

Mini Roses should be planted 8-12 inches apart.  The best time to prune is in early spring when buds begin to swell; then you can see what is alive and dead. Mini roses can be pruned just like any other rose but if you want to maintain small plant, cut them back 3-6 inches from the ground rather than 8-10 inches. The other option is to cut it back by 1/2 to 2/3. Be sure to remove any dead, diseased and damaged stems as well as any thin, twiggy growth. When pruning, use sharp clippers to get a clean cut. Cut the stem on an angle above an outside bud.  Pruning will keep your plant in good shape and good health.