>>48706405For forwarding services, you sign up and they give you a ship to address. When you order from the Hololive shop you put that in as your ship to address (they usually have a guide on which field to paste stuff into if you don't wakaru your kanji). You pay for the hololive shop to ship it there and get charged 1000 JPY domestic shipping
Once it arrives the forwarder should send an email saying a package arrived for you. They may ask you to fill out item descriptions/values for customs. There's a period where they will hold it for you while they wait for your payment; if you have more packages coming within that period you can wait and pay a fee to have them combine them into one shipment which may be cheaper to ship internationally. Not sure how it is for other services but for Tenso if you have multiple packages you want to wait for all of them to arrive before you consolidate. Once consolidation is done you pick from their shipping methods (they tell you the price for each), pay for international shipping, and they ship it.
Proxies are the same except you use their site/browser extension to order (I think you'll struggle to get signed merch because when you "order" that tells them to place an order). The upside is proxies can buy from sites like Mercari or Yahoo Auction that don't take gaijin credit cards
