You should be able to just disconnect the battery, plug whatever SRS harness connector you unplugged back in, and reconnect the battery. The light should turn off. If it stays on, you might have bigger problems.
See if you can buy a code scanner for less then $120 and do it yourself and have a scanner for future use and vehicles. I have gotten very good use out of mine and helped a few others.
Any luck? Just picked up an '05 and would like to do 1-click unlock, seatbelt chime, and if our rigs have it, soft touch 3 blink signal. In the Seattle area. Thanks!