You can probably ignore the night-sights as regular three-dots until you need to grab your gun in the dark. Then they're like magical little landing lights that unerringly guide your hand to RIGHT wher the gun is-no fumbling in the dark, knocking it off the nightstand, etc.
Dark enough to REQUIRE the night-sights to align the gun to the target is dark enough to make target identification difficult even at just a few feet of range. ID-ing the target's pretty important before you pull the trigger, so don't over-emphasize the need for them.
Glocks ARE pretty good right out of the box in my experience. They don't NEED a great deal of improvement, usually. The trigger mods folks are mentioning DO work well, but that's a judgement call for you. I put a 3.5 # disconnector in my G-32 right after I got it, and I couldn't be happier, and my gun had a darn smooth trigger to begin with. But now, it's Target-Grade-extra-smooth.
Loud seconds on the .22 conversion kit. Worth every penny, and Cieners or Marbles units can have phenominal accuracy. They often out-shoot the base gun.
Couple things to do to address the felt-recoil issue: Run lighter ammo. .40's go down to 135 grains. 150's and 165'as are easy to get, and that can make a big difference compared to a 180 or 200.
You could also get a .357 Siggy drop-in barrel. l bought my 32 because I found a stock .40-cal. barrel that was the right length for no money. BIG difference in recoil feel. Lotsa fun, also.
They might have a LONG trigger like a DA revolver, but they certainly don't have 10-12 lb.s of draw-weight. Less positive index-feel, too. No cylinder flywheeling about. Just something to bear in mind and not get complacent/cavalier about.
Putting some mileage on the gun'll go a long way towards getting rid of awkward-ish feeling.
However...
Do not, DO NOT, DO NOT! RUN UN-JACKETED LEAD BULLETS THROUGH A STOCK BARREL WITH POLYGONAL RIFLING!!
I'm yelling on account of no-one's said it yet. Reloads you can run...
But NO un-jacketed soft lead bullets! Otherwise, the polygonal rifling will get coated thickly with lead-fouling, resulting in a pressure spike and potentialy a split barrel!
We're having none of THAT nonsense.
Besides, it's a social faux-pas to date bullets without jackets. Eet vould prove moozt eem-bahratzing, yah?