Here's more or less the progression of replacing the trigger...
I got the Bob's's trigger in today. If you follow his directions, it'll take about 10-15 minutes to take the gun apart, remove the trigger, install the trigger, and put everything back together. It took me two and a half hours. Needless to say, I didn't follow the directions.
Remove the E clip on the trigger pin. Remove trigger. Remove trigger spring. Remove guide pin from trigger. Install guide pin in new trigger. Install new trigger without spring. Replace rifle in stock. Torque screws to 20 inch/lbs. Test airgun.
Remove E clips from safety pin and trigger pin.
Watch an unknown spring go flying into the grass.
Cuss and pray I can find the darn thing.
Said under my breath, "screw it! I'll find it later."
Turn rifle upright. Watch parts fall out of the trigger cover.
Notice there's another E clip that wasn't remove. Figure it's the same size, so it don't matter if I place it with the other E clips.
Remove E clip. Watch another spring go flying towards parts unknown. Realize that, while watching the spring fly, another (more than one?) part fell into the pile of parts.
Pull out smartphone and google trigger replacements on youtube. Get disgusted with some pimpled face teen telling me everything on how to take apart and put back together the airgun, except the trigger.
Watch another video. Again, no info on how to take the trigger apart.
Go search for springs that went flying.
Found the trigger spring.
Can't find the other spring.
Go to the garage for my parts finding magnet. Can't find it.
Found my welding magnet.
Found the other spring. It was on the tailgate right about where I was leaning on the tailgate.
Pulled Bob's note from my pocket. The one that came in the envelope with the trigger. Notice there's a couple of web addresses that has instructions.
Check out the videos. By pausing the videos in the right places, I can see and figure out how the parts and springs go.
Of course, there's always that one spring that gives you a fit. I figured that if I remove one more piece, I can get the part in without too much pain or effort.
Count the turns it takes to remove the screw. It's an adjustment screw, so I have to pay attention to the revolution count. Neighbor stops by and starts talking. I lose count.
Cuss under my breath.
I get my pistol out from my truck, and place it on the tailgate next to me. The neighbor leaves.
I cuss out the neighbor under my breath again.
I get the part in with the spring in the correct position. I install the part that I remove that has the adjustment screw. I get ready to install the rifle back into it's stock when I realize I had a part backwards, and have to remove the trigger and the part that holds the adjustment screw to turn the part around.
The parts are replaced in the correct position, and the correct places, the springs are installed, and the airgun is now back in the stock, screws torqued to specs. I go to test the air rifle. I pop off the scope covers, adjust the parallax, take aim, the trigger has very little travel. Needs to be adjusted. The pull weight is nice. Not too heavy, but borderline a bit more than what I like. However, it's a safe pull weight, and not too heavy.