The Yugo Tokarev?
I wouldn't disassemble the trigger mechanism at all.
It's exposed enough that you can clean the cosmoline off with mineral spirits and brake cleaner and then relubricate.
BUT, if I recall correctly, the only thing you need to do to remove the Tokarev's trigger, once you remove the sear and hammer assembly, is remove the magazine release. The trigger should then slide out to the rear.
"The gift which I am sending you is called a dog, and is in fact the most precious and valuable possession of mankind" -Theodorus Gaza
Baby Jesus cries when the fat redneck doesn't have military-grade firepower.