When I lived in Nevada, whatever was too big for the curbside garbage pickup needed to be hauled to the dump. Residents could use the dump for free. If I could fit the item in my own car, I'd haul it there myself. If not, I'd find a friend with a pickup truck and do it that way, "paying" said friend in beer, lunch, or whatever! Now that I live in a high-density Israeli town, I see people getting rid of large items by simply putting them next to their communal dumpsters. Lots of people just come by and take those items privately, so it works as a kind of informal Freecycle program.
Anyway, like other posters have said, don't be down on yourself. Decluttering is sometimes like excavating a site with multiple layers of sediment. There's the surface layer, and then more gets uncovered and dealt with, and then another layer "seems" to emerge. It was all there, all the time, but since we'd dulled our awareness about it, it seems that the more we uncover, new clutter seems to appear! This is a normal part of the process, as is dealing with frustration and a lot of other emotions. But remember, "no shame, no blame," and just keep going. You can work through these uncomfortable feelings, you can "do hard." You're doing it already!