With my first labour my baby was back to back for most of the labour. For the time that I was pushing I felt like I was pushing, but there wasn't anything there to push out or against, if that makes sense? I pushed for 4.5 hours in total before ending up with a forceps delivery. My baby did turn the right way round before the forceps were put on, and he was at +1 station at that point, so properly engaged, but in all honesty I don't remember it feeling any different to how it felt when I went into labour (or even before I went into labour). As I had a spinal with the forceps delivery I have no idea what it feels like when you're actually pushing the baby out.
I'm now pregnant again, and have no idea what to expect from labour. Did anyone else have a similar experience with pushing and not feeling like you were pushing anything? If you had forceps delivery the first time did you manage to have an unassisted birth the second time?