The hammer spring is not really easy, but it is not that bad either.
To pull out the disconnect:
Mag out, unloaded etc. Take the slide and barrel off of the frame.
Drive the trigger pin out from the right side to the left. Put some tape around the pin and use a brass drift. Using a bench block really helps with this. Be careful. They are really in there and takes a pretty good whack to get it out.
With the pin out, take the trigger group by lifting it up and tilting it out from the bottom, through the trigger guard.
Then using a smaller puch, drive the disconeect pin out of the trigger with it out of the gun. Don't do this in the gun, it will stress the trigger.
This will allow the diconnect and spring to come out of the trigger. Store for futuer restoration.
Reverse the process.
Hammer spring.
Field strip the gun.
Look at the rear of the hammer area below where the serrations would be. You will see the sear pin. Drive the sear pin out from right to left. This will allow the sear to pop out. Then take the sear leaf spring out.
Rotate the ejector down 90 degrees. If you have an ambi safety, drive the roll pin out of the right safety lever and then remove. Wiggle the left safety, lifting it away from the frame like you would a 1911 safety. There is a "nipple" on the safety shaft that must come through the slot in the ejector. Just wiggle, it will align and come out.
Take the safety out, then remove the hammer, spring rod and spring.
You have to compress the spring, then screw the retention cap down until you clear the pin that holds the cap on. Drop the pin out, then unscrew the retention cap. Be careful, it is under pretty good pressure.
Install the new spring. I can't tell you the best way to compress the spring. I used some help, a bench vise and some patience to get the cap screwed back in. Then replace the retention pin and unscrew the cap until you get it snug against the pin.
Install the hammer/rod/spring back into the pistol.
Install the sear spring.
You will have to hold the hammer back, compress the sear spring and push down on the sear, all at the same time to get sear pin back in. Install the safety first as you will need to lever the hammer back. Be sure to comress the detent pin on the safety when reinstalling the left side.
With the safety back in, try using a clothes pin to hold the sear pin to the frame and hold the hammer cocked back.
Install the sear pin.
Reverse from there.
To install the firing pin spring.
Take the slide off. If a MKIII, then you must compress the sear lever in the slide to get the firing pin to move. Just insert a punch or whatever into the firing pin hole to push the firing pin in past the retainer, then slide the retainer out of the way and remove the pin.
Hope that helps.
Deez.
