I assume that what is loosening is the front section of a two piece full length guide rod. You can do several things to fix it and they are all correct. You can replace those parts with a shorter GI recoil spring guide and plug. You can try cleaning the threads of any oil and screwing the sections back together snuggly. You can buy an aftermarket full length guide rod from a "name" maker like Wilson or Nowlin or EGW and replace the factory unit.
As to turning your bushing, remove the front section of your FLGR, then you initially turn it clockwise (as viewed from the front) while you depress the recoil spring plug (wear safety glasses). Capture the plug as the bushing releases it. Once the plug is removed, you turn it all the way counter-clockwise, then remove the bushing from the front of the slide. If you can't turn it with a plastic wrench, you're either doing something wrong, or the maker has fit the bushing to the slide way too tight. Get an aluminum wrench from Brownells. Good Luck!