You want to be careful to not compromise the shape of the pretzel dough as you are transferring it to and from the boiling water. I typically use a slotted spoon to get the pretzels out in order to help them hold their shape and avoid squishing them. You can use tongs, but be cautious and try not to squeeze the dough too much. Boil the pretzels one or two at a time, for about 10-15 seconds. It does not take long for the baking soda to do its thing!