First, decide you want to do this in the morning or in the afternoon. Choose a day.
Take the MRT(Taipei metro) to Xibeitou station, there is only one exit, the guides will pick you up there.
Remember to bring your own water, the duration is 4 hours.
Wear something you feel comfortable to move, do not wear jeans.
Full equipment will be provided, including helmet / harness / rock climbing shoes.
The approaching is a short and easy walk up-hill, about 15-20 minutes, as a warm-up.
Then you will be taught properly about basic things. The guides speak Chinese and English.
There will be two rock climbing routes set up for you, one is easier, one is a little bit more challenging.
If time is enough, you could even try more than those two climbing routes.
And you will experience a 20 meters high rappelling on a totally vertical wall.