With the rudder hard to starboard, a sharp burst of reverse will shift the stern to port (prop walk] but only until the boat is moving. Then, keeping the rudder in the same spot, pair that with forward thrust,? until reverse movement stops. The bow will have started to turn starboard. Then, another burst in reverse until you start moving. Repeat. You can spin the boat clockwise in one spot in calm conditions. Practice until you can tell how much power it takes to counteract the forward movement. Backing up straight can be harder than turning, depending on the wind and current. Congratulations on the new boat. Great choice.?
