They're easier than they look. It takes most of them three years or more to approach a stage of maturity which warrants pruning. When the plant has matured, assess the main, or basal, canes and remove at the base any which are diseased, dead, or damaged. Lateral canes smaller in diameter than a pencil are best removed right down to the main cane. Larger laterals might be cut to about 4 bud eyes in length.
Miniature roses are easy.
If it grows like a little Floribunda, prune it that way. If it is a Miniature Climber, it will appreciate being treated like its larger counterparts. Thanks to Jeri Jennings. This is the final task of pruning time, and it is a vital one. Dormant spraying should be done immediately after pruning.