Forgot to mention, I have Aeroshell 33ms and automatic center punches for properly installing the castle nut and staking it.
Be sure to support the trigger guard tabs on the receiver while installing the guard.. If not, you can relatively easily break off one of the ears of thee receiver. Not hard to do, again, the Wheeler armorer block helps with this too.
FCG installs with ease using the Geissele trigger fitting pin ($15 tool). The end is beveled/chamfered so it makes lining up the disconnect super easy for the pin to drift in. You can do the same thing without tools or by using a regular drift punch, but the Geissele tool is one of those nice to have things laying around. Just dont forgot to double check that your hammer spring is installed correctly and not backwards.
Last tip from me. If your grip comes with a flat head screw vs a socked head cap screw like Magpul provides, put painter/masking tape on the correct size flat head to help install the screw. If not, you will end up trying to drop in the screw with needle nose (which can get annoying). The tape on the screw driver head will hold the screw and allow you to easily get it started without risk of cross threading. If you do cross thread though, a 1/4-28 tap can repair the threads (I have one if you need it).