Getting a .45 for a first handgun is a hard way to start -- like trying to start riding on a unicycle instead of a two-wheeler.
If its truly a first handgun, be prepared to be overwhelmed for a while, but you'll eventually get past it. Its a "different" experience than a .22 or 9mm gun; recoil will be daunting, at first.
Shoot a lot, and if possible, get some instruction from a local NRA class (available at many local ranges.)
You've bought a good gun, so be patient. Good results will come -- but it may take a while.