Drive on over, I will show you how to do it.
Or, use google and find stuff like this. I do it in a slightly different order but this will work. The mainspring is easy to remove. I hold a shop rag over it and tap the retaining clip out with a screwdriver handle.
Be sure not to mix up the bottom plate retaining screw from the side retaining screw. Get the longer one on the side and it locks up the action. Been there, done that.
I have mine apart a fair amount for a really good cleaning.
See, even a pharmacist can do,it.