Teavana is my favorite as well. You may want to try their "perfect tea maker". I have one at home (the large one) and the small one at the office. It makes making tea very easy.
If you don't use something like the perfect tea maker and you are just using a pot then you just place a strainer in your tea cup when you pour the tea in. The cast iron pot I have has a mesh strainer that sits in the pot. It is designed for you to put the strainer in the pot and put the leaves in and brew it that way, but I found that there is not enough room for the leaves to expand that way so I just take the strainer out and use it in my cup when I pour the tea.
I can't recommend the perfect tea maker enough though. You can find it here.