Being a wireless Genie mini owner myself (assuming this is what you're specifically talking about), while technically the WVB (Wireless Video Bridge) is a relatively easy setup to perform (assuming that you're OK with dabbling with your Internet router and changing settings without totally bricking the device

), yes, DirecTV requires a truck roll to make the setup happen.
One aspect of the setup is the power supply that goes with the WVB. In generally researching this device, I noticed that the supply brick actually outputs power onto the coaxial cable. If this power is injected into the network in the wrong way, you'll essentially ruin a good portion of your setup (potentially including the Genie DVR itself).
As a practical matter, wireless Genie minis are very good and very cool devices. It'll have been a year this May since we upgraded, and we have no regrets at this point.