I was going to get some of my stuff from K-VAR and some from Dinzag, but after factoring in shipping, it ended up being a few bucks cheaper just to order everything from Dinzag - and Tony even dropped in an extra set of cotter pins and a set of E-clips for me. Nice guy! I did order the cheaper of the two triggers; it looks like the more expensive one is just cut out for reinstalling the bolt hold open, which I didn't care for anyway.
I had no problems with my tap; I went slow, used lots of oil and backed the tap out every quarter-turn, as recommended. The hard part was drilling the hole perfectly straight down (I didn't) and keeping the threads continuous (I fudged that a bit). It took a little trial and error to get to a point where I could actually screw the screw into the hole, and the head ended up being slightly above the level of the bullet guide and causing the bolt to hang up about 1/8" out of battery; took a small round file to it and two minutes later everything was fine. It doesn't look pretty, but it works.
And actually, I take it back: the hardest part of the whole process is working up the gumption to start grinding on your receiver in the first place. Once you get past that it's smooth sailing.
For the trigger plate rivets, I just Dremeled the heads off as much as I could with a grinding wheel (who cares if the trigger plate gets scuffed up? - you're throwing it away anyway) and, once I couldn't grind anymore, I started a small pilot hole with a 1/32" bit, to keep the larger bit from wandering, and then drilled what was left of the heads down with a 1/4"(?) bit until I was able to pop the trigger plate off, then ground the rivet shafts down a bit more and tapped them out with a punch. Took me maybe fifteen minutes, and that was 'cause I was nervous and trying to be careful.
The trigger group pins came out no problem following the Cross-Conn directions to drill the shoulders out (and despite what it looks like in the pictures, no, you aren't actually drilling into the receiver - that unnerved me a bit) and my pistol grip hole was already punched.
On the advice of another THR member I used matte black brush-on Krylon to refinish my receiver; perfect match except for the texture.