tutter,
I can tell you after carrying for two decades that there are many things experience teaches one. One is, choose a caliber you are comfortable shooting, at night, without ear protection. The Clint Eastwood .44 magnum crowd is well-defended, but are also deaf and blind after the first shot in reduced light.
Second, Clint Smith of Gunsite Ranch was correct when he said, "Wearing a gun is supposed to be comforting, not comfortable." You have to wear your gun EVERY day for at least a month before it will start to be comfortable. I agree with poster above that said wear it around the house all day, every day while waiting fr your permit.
Third, there is NO such thing as a good, cheap holster. No one that has watched their gun skitter across bathroom stalls when they were sitting down to business ever bought a cheap holster again! a cheap holster could mean the end of your CCW permit. if at ANY time the gun is seen and/or you lose control of it (bathroom mistake above) a civilian can call the police and you have to go before a review board, possibly to have your CCW permit revoked. Your license and your life is not worth it! buy reputable holsters from DeSantis, Crossbreed, Don Hume,Link Removedor the like. If you want Kydex, make sure the holster maker has credentials, such as working for state and government agencies, like Link Removed. it seems that everyone able to fire up a heat gun now thinks they are holster makers because of Kydex, and it just isn't true. Also, a holster is only as good as the belt it's on - a $250 holster on a $10 Wal-Mart belt is worthless. you MUST have a reinforced pistol belt to hold any quality holster. Trust me, you will see a difference.
Fourth and final, practice your draw and your trigger control on shoot/no shoot targets. Not every initial threat turns out to be something you need to engage, so it's important to also know when not to shoot. practice with all your clothes on and clearing jackets, gun covers or long shirts from your holster and getting it into battery - it's a lot different in life than in your head.