Killer,
I will have to tell you taking Perc's for 2 years straight and now stopping cold turkey is going to be rough. If I were you(and I'm not) I would contact my dr. And inform him of what you are planning to do. If you've been taking them as prescribed and not abusing them then I would suggest a taper with your drs help.
I'm not going to candy coat this, cold turkey is rough, I did it, but I wasn't taking Perc's daily for 2 years either. I'm not saying you can't do it I'm just saying if you can taper with help I'd do it.
Keep us updated!!