I agree with zuzu. Topdressing your roses with compost or your amendments of choice will help.
Regular watering, feeding with rose food like Rose Tone may also help.
You can dead head and trim the shrubs a bit anytime. Pruning roses for the first time is daunting. Paul Zimmerman has some good videos on rose training and pruning and a good rose gardening blog. You can find links on the FineGardening site.
Make sure you have white glue (Elmer's or similar) with you while pruning. Use the glue to seal the ends of cut canes wider that a pencil to prevent boring insects from damaging the rose.
