My property has an old irrigation system. It works well for the original landscaping. Now, however, I am reworking my yards and removing much of the lawn and replacing with planting beds and containers. The current irrigation system needs to be upgraded by a combination of new/different sprinkler heads, adjustments as to where they spray. I want to use what I have and not do a lot of digging and installing new lines. What professionals should I contact? It seems that when I look at websites for landscape contractors they are advertising huge makeovers probably costing many thousands of dollars. My job, in comparison, is small. Any ideas would be helpful.