Usually you can go through almost the entire order placing process (including filling out your info) and see shipping total before you have to *actually* place and pay for the order completely. It will probably say "confirm order" or something similar and you'd have to click that before the order is finalized, the shipping and order total would be shown before that. If it's too much you can go back and take things off. I hope that made sense.

p.s. I've ordered on the phone and asked questions/taken items off and they've always been fine