Re:
Sorry I didn't get notice you replied.
I stood on a junk seat and twisted the bike upside down (i.e. surface of saddle on floor and looking down at the bottom bracket near my chest). This was after penetrating oil for a few weeks. Seat gave up the ghost first!
I didn't need any other tools to get it out with freeze spray. I didnt think it would work to be honest so wasnt that well prepared. Gave it a try and didnt budge using a quarter of the can. Sprayed the rest and then twisted it out by hand. One little twist to free it up and then it slid out like a nicely greased seatpost should.