Remember, there are 20 of you and only one teaching assistant in your lab. You may be feeling anxious and frustrated at times as you may not be able to get the help you need immediately but please be patient.
Your teaching assistant will come around to provide whatever support they can, however there may be a bit of a wait. While you are waiting on your teaching assistant see if you and your partner aren't able to figure things out together. You may find you do not need your teaching assistant when you put both heads together.