Once the bird is comfortable around you, it will stay calm as you approach it, and may even eat the treat directly from your hand. This may take weeks or months for an adult bird that is not used to close human interaction. Once you've reached this stage, you may convince the cockatiel to leave its cage, although some older birds that did not grow up socialized may not voluntarily do this. Make sure all windows and doors in the room are closed, and no other pets are present, before you open the cage. Once the bird will approach you and eat from your hand, start approaching it in a similar way with an empty hand, extending two fingers horizontally. Hold the hand in position until the bird calms down, rewarding a bird with a treat if the cockatiel remains calm. Again, keep these sessions to 10 or 15 minutes, once or twice each day. Eventually, move your hand directly to the bird's perch, or touch its feet. Once you can keep your hand there without agitating the bird, gently push the bird's lower chest with your fingers. A light nudge should be enough to slightly knock the cockatiel off balance, and cause it to step on your finger with one foot. Each time the bird starts to step up, say a short command such as "step up" or "up." Praise the bird and give it a small treat when it does this. Praise again when bird steps with both feet. Keep training sessions to a few minutes at a time, making sure to always end on a positive note. The cockatiel may use its beak to test the stability of your finger. Try not to jerk your hand away when the beak touches your finger. Once the bird will step onto your finger on command, teach it to "step down" onto another perch using the same method. Reinforce these behaviors by teaching it to "ladder," or repeat the "step up" command from your left hand to your right and back again. Train the bird to perform these movements daily, until it will do so on command without a treat. You do not need a special command for laddering. Repeat the "step up" command instead.

===
Write a summary of the previous text in Indonesian:
Bukalah kandang hanya jika burung Anda sudah merasa nyaman. Tetap ulurkan tangan Anda ke arah burung selama latihan berlangsung. Doronglah agar burung mau naik ke atas jari Anda. Doronglah agar ia mau mengikuti perintah yang diberikan untuk naik. Ajari burung Anda untuk menaiki dan menuruni tangga.