If your picking up a item would be able too try it on ? And if it don't fit you would u be able to change the size

Yes and yes.

yes and yes. l did

Yes. Macy's has fitting rooms. That is common in large department stores.

Yes but not sure if you can exchange size at the same day because there's models are only available online

I believe so. Macy's usually has great customer service and returns are very easy.

Yes it's just like any other store, there are fitting rooms there and a return policy within a certain amount of days unless it's a sale item.