Do a Gancho as a Follower
Step1
Take your regular step. Because a gancho is an interruption of a step, keep your focus on the regular step your partner is leading. If you try to accommodate his lead because you know he wants you to do a gancho, the resulting gancho will be artificial.
Step2
Stay open to your leader at the end of your step. Some ganchos require an additional pivot to be comfortable for both follower and leader. If you follow your leader, you can pick up on this pivot and be able to execute the gancho.
Step3
Allow your thigh to strike his leg first, then allow your lower leg to swing upwards. The best gancho is a natural gancho rather than an actual kick or lift of the leg. However, once you become comfortable with ganchos, you can play with the intensity and momentum of your movement.
Step4
Let your leg fall naturally back to a gather, or bring it into the next step if he leads you to. Once you are comfortable with ganchos, you can occasionally play with holding your leg against the leader's leg for a moment if it fits with the music and with your dance style.
Step5
Steal a gancho wherever you find one. When you have an opportunity and enough time, you can gancho your dance partner. Only try this after you have mastered ganchos and have strong following skills, or else you may end up tripping your partner.
Step6
Realize that your partner may do a gancho to you. As in all tango steps, as long as you listen to his lead—even if it seems like he's asking for something unusual—you will do the right thing with your body and will be able to accommodate his gancho.
Do a Gancho as a Leader
Step1
Keep your partner close to you. If she is far away when you prepare for the gancho, you won't be able complete your gancho.
Step2
Lead your partner into a forward step and then block it, stopping her so her weight is distributed between her feet. Most of her weight should be on the leg that you are going to gancho.
Step3
Make sure there is enough space for a gancho. A follower won't appreciate it if you try to do a gancho and instead kick her shin. Practice to explore the amount of space you need to effectively do a gancho.
Step4
Gancho her. Allow your thigh to come in contact with her leg, and then allow your lower leg to naturally swing up to meet her leg. Bring your leg naturally into its next step.
Step5
Play with the musicality of the movement after you master the gancho. Use it to emphasize beats in passages of your favorite tangos.
Step6
Realize that your follower may gancho you even if you don't lead it. Whenever she senses the opportunity and the timing, she may steal a gancho. Be sensitive to her additions to the dance.