How to disassemble bolt?

[mainly_22s]

Thanks for the reply. I omitted one piece of information in this post which was in my other thread. And that is that the cocking piece knob is missing from my bolt assembly. I'm thinking for purposes of bolt disassembly I could maybe get away with vice grips? At present there is no grippable surface on the cocking piece.
I'll follow your instructions to try and disassemble the bolt. Was hoping there was a well known jig of some sort to ease the process but I guess I'll make do.