JFC don't "grind down" those notches. They aren't just for decoration...
#1 is the half cock notch, it's an additional safety feature that will keep the hammer from falling if the SA notch breaks.
#2 is the SA notch that engages the sear when in SA mode. Very precise engagement surface that is easy to F up.
DIY trigger job for Beretta 92FS (not the D spring upgrade)
Here's my personal recommendation. I've done trigger jobs on both of my 92s
1. Replace hammer spring with 92D hammer spring. This will immediately take off ~2-3lbs from the trigger weight while maintaining reliability. The 92D hammer spring was specifically for the 92D (DAO version), but is fully compatible with the 92FS.
2. Polish the grey circular areas of the hammer and sear (see the picture in the link above)
3. The parts of the hammer and sear highlighted in red require very precise polishing. Go too far and you will F up your sear engagement, resulting in a nonfunctioning firearm. if you don't know how to do this, skip step 3.
The alternative if you don't want to do any polishing is to buy Earnest Langdon's Beretta trigger job in a bag. This will give you a seriously amazing trigger job
Trigger Job in a Bag - 92/96/M9 Series