That's gonna depend on the year of your frame....
Newer one will also need the transfer bar to be removed.
Check the FAQ's on trigger jobs. A good explanation of disassembly is there. Its not difficult, but make up a "slave" pin before you start. Use a piece of a drill just under sized to the hammer pin and shorter then the inside width of the receiver to hold parts together as you assemble. Then it gets pushed out with correct pin.... Save it for another day..
Good luck,
CW