Trying to install overwound single coil in ASAT Classic

This is my first time trying to install a pickup that requires cutting a piece of the wood out. i'm nervous doing this but i really want to install the overwound MFD single coil in my ASAT. any tips? also, i have a pickguard that "almost" fits the pickup, but it looks like i'm going to have to shave it down a little bit. the screws are supposed to show through the pickguard right? Help?!

B.Love
- '91 ASAT Classic
- '91 S-500

Not clear what your plan is here. What pickup is going in what guitar? The standard ASAT pickups require a rout of a particular size and depth. Are you putting one of those in an AC neck position?