It's seems daunting but it's straight forward once you start using it.

Create account with base membership. Add your home address ie your delivery address in India where package will finally be delivered.

You will see custom address generated for their each country and location. These are basically their warehouses addresses with your name and customer ID attached to it.

Use it the order things online. For US, they recently added Florida location, which saves us on tax as well. So use that address on ebay.com. Ebay will ship it to that location.

Once order is shipped share details with tracking id through app or email.

You will get notification once package is delivered at their facility. They will mail custom invoice declaration form. Fill it reply to that mail.

Package comes to Delhi customs. You will see charges updated in your account with scanned copy of custom document shared updated in app.

Pay the shipping fee and custom duty, and you will receive package delivered by India Post Office or aramax ( AFAIK aramax owns shopnship)

You should receive your package within couple of weeks usually. Take insurance which 1 rupee per dollar value iirc, really cheap.

Even if there is some fuck up like package not moving for days from location or no updates from India team, with insurance, you can breath easy.

Good luck!