The first thing you should do is check to see if you have a 2-piece catch, as older guns did not. See this
LEM installation guide for more info. The LEM kit comes with everything you see below (
link here). Even if you don't have a 2-piece catch, you can still upgrade to a 2-piece catch, and install LEM.
When you install LEM, you will lose your decocker. But you get to keep the safety lever if you wish. It will only function as a safety.
If you have any questions, just ask. There are plenty of knowledgeable folks here and they're more than willing to help.
Catch:
LEM Kit: