It's hard. No doubt about it. Feeding the neighbors dog while they go to Fiji or watching our cruddy old box TV after visiting someone with a 50" plasma really burnt sometimes. And then the neighbor on the other side gets a pool and we're like WTF we can't even afford curtains.
I think we got through it my telling ourselves that we can lash out later. We would have the occasional splurge but the more we got paid down, the less we wanted to lash out IYKWIM. When we finally cleared out personal and CC debt and just had the mortgage it felt brilliant