Go out on the lake and practice backing up with one drive in forward and the other in revers. The drive in forward will have more drive then the one in reverse so you keep the RPM's of that motor lower then the one in reverse. If you practice out away from everything then you will be able to see what different things do and how it makes the boat move. You will feel a little weird doing it and people may think that you have lost your mind but it is better then crashing into the dock or worse some one elses boat.
