<whispers so as not to appear patronising> We open the boxes before the day, remove the ties, and replace the item to save disappointment/delay on Christmas morning. Likewise anything which needs application of stickers is sorted before FC delivers.
I open all the boxes, remove the ties and put the thing back in then wrap for all family kids presents. For ds he is only 1, everything is out the box and built up, GPs are also doing this at my request.
I have a mini penknife which has a small pair of scissors that work well on these too. I had removed them from the toys from us, but the toy from a friend had them on and needed to be cut from the box to get to them! Of course this was the toy DD wanted immediately!!! (We had our little family Christmas on Sunday due to work commitments)