I had mine done in the office. I had the Thermachoice Balloon one. You will do just fine with it. However, it is very much an individual choice kind of a thing. They will probably give you something for nausea too, in addition to something for pain. Im sure a Paracervical Block might be used too. Its really not bad at all. I guess I should say I do have a fairly high tolerance for pain. I really wanted an in office one from the beginning.
Good luck! Let us know how it goes.