It seems pretty complicated to me, but maybe you can point out some resources that make it easy?

My current invoicing system is a simple tool that generates PDFs. I send those to my customers by email (and rarely an angry reminder by post), and I get paid. Good stuff. My suppliers similarly send me PDFs by mail, and some of them send me paper invoices by post. All very simple. I pay them every month, and once every quarter I send those on to my accountant so he can do his thing.

All this sending and receiving has been free so far. But with PEPPOL, I'll suddenly need some third party tool with some kind of paid subscription, to continue to do what I had been doing for free before.