As stated before, wing trimming is essential to provide a safe environment for your bird. For those of you who would like to attempt to trim the wings yourself (after being trained in the correct procedure), the following diagram and instructions may be helpful.
There are several methods of wing trimming. The preferred technique for ultimate safety is to trim both wings. By trimming the flight feathers of both wings instead of just one, a bird can maintain a safe, controlled glide to the floor. When only one wing is trimmed, balance is thrown off, directional ability is lost and dangerous crash landings can occur. For a correct trim, extend the wing and work from the top.
Begin cutting off the wing tip and work inward, cutting the first five to eight primary flight feathers on both wings. Trim the feathers along the line created by the bottom of the greater primary coverts. You should never cut blood feathers. These maintain a large supply of blood and cutting them could result in serious blood loss. Safe wing trimming requires two people and a good restraint method.
In order for wing trimming to be effective, it must be done on a routine basis. New feathers continually grow in, and many pet birds have gained access to the “outside world” because their owners forgot to keep their wings trimmed. There is no set timetable for wing trimming: it depends on each individual birds rate of wing growth, but they should be checked at least every three to four months.