I had problems with mine, mainly due to lack of quality drill bits. Get yourself good drill bits, if nothing else! Those spot welds are hard. I'd also recommend a drill bit specifically made for drilling spot welds. If you don't have a drill press (I don't) just be sure to center punch before drilling. A dremel is also a nice addition. I used mine to clean up the spot welds and cut the trigger hole for the second hook of my trigger (with carbide cutter).
On the .308 model, there are 2 rivets (fore and aft) and 2 spot welds (left/right under the trigger guard) holding the plate to the receiver. You'll also be cutting the spot weld holding the trigger guard to the plate for future use/access to the 2 receiver spot welds. Once that plate comes off, you're basicly home free. Prior to doing the conversion, you can also verify if your PG nut hole is precut by looking down in the receiver, most are. I was nervous too, but it went fine and I'm not the best at working with tools.
garr, the Tapco G2 is the Gordon Tech FCG. They're now exclusively sold/distributed through Tapco.