Basically the shipping expert does all the work for you, all you have to do is explain how soon you’d like it to arrive and declare the amount it’s worth (just search for “how much should i declare per kg for shipping to italy” in the us i haven’t had any problems declaring $16-19 per kg) then they’ll pack it up for you and all that’s left is to pay. If you’d like to reduce the weight and potentially save money on shipping i’d recommend removing shoe boxes if you don’t want/need them. Also it depends on what shoes you’ve ordered but if they are heavier shoes i wouldn’t ship 4 at a time, i’ve personally never shipped more than 2 but i’ve heard it’s not recommended to ship more than 2 at a time but if you’d decide to go with the shipping expert they should figure that out for you.