I would not be hesitant at all in designing and installing my own sprinkler system. Rainbird,
Rain Bird - Do-It-Yourself Home Page , Toro,
Toro - Sprinklers and other companies have software on their websites that will help you design the system. You need to take into consideration the flow and pressure you have available, this, along with differing plant water needs, will determine how many valves you need to install.
The websites will also suggest sprinkler models to use for each scenario, how many and how far apart to space the sprinklers.
If you plan to install drip irrigation check out Netafim’s website
Netafim Drip Irrigation - Drip Products for Landscape. John Deere Landscapes
John Deere Landscapes may also be helpful
You will probably want to rent a trencher, walk behind or ride on depending on the scope of your project.