Ok, Just for you cptmclark
I decided to pull mine out of the wood. To be honest, it's been so long ago, I had completely forgotten what the trigger group looked like. (I'm also glad I did take it out, it was starting to rust a little under there!)
Anyway, the only rivet I find on mine (trigger group) is near the top of the group (closest to the bolt), if yours is the same way, ignore that rivet, it's not part of the plan anyway.
Honestly, it's been at least 12 years since I did this, and it's a little vague.
First, remove the bolt.
Next, find a pin punch that fits the lowest roll pin (the one closest to the actually trigger), It looks like about a 1/16" roll (or spring) pin.
Carefully, drive out that pin, drive the punch all the way through the trigger housing to keep the trigger from jumping out.
Hold pressure up (toward the bolt) on the trigger and remove the pin punch.
Take out the trigger and the spring SHOULD be setting right there on the back top of it. I say SHOULD because that's the best I remember.
Install the new spring and assemble in reverse order.
It's really not that difficult of a job changing the spring, if you want to go any further than that, I'm sorry, I can't help you, I simply don't remember any more details. Once you get the trigger and spring out, you'll see that it's not a complicated device at all.
I THINK that the other parts in there will come out of the bottom of the trigger assembly if you remove the other roll pins, I THINK I took mine out at one time and polished them that way.
I wish I could be of more help, but go ahead and jump into it, I DO remember that it isn't overly complicated putting it back together. There simply aren't that many parts in there, and only one spring.
If you have any troubles, let me know and I'll look at it a little closer for you. Either way, let me know how it goes.
Also, disregard my previous post about this being hard to do, I obviously had another rifle in mind when I said that. The hardest thing is lining it all back up properly, with a little patience and persistance you can do this!