the 3 big things that are different about IDPA vs your regular range visits:
-drawing from a holster to shoot (aka shooting from leather)
-shooting on the move
-reloads at a non-leisurely pace
with appropriate precautions and some snap caps, all these can be refined in your home. these precautions include:
-empty all mags of ammo
-empty all pockets of ammo
-put all this ammo in a different room
-check, double-check, and re-check your firearm for an empty chamber
-every time I drop the hammer on a snap cap, I still aim such that on the 1:1million chance I discharge a live round, despite all precautions, I'm only looking at some drywall and exterior sheeting repair and no more.
to practice shooting from leather, the big thing is to make sure your trigger finger is straight when you grasp your firearm, and remains straight until the sights are on target. same with re-holstering. make sure trigger finger is straight, and that no part of your clothing finds its way into your trigger guard as you re-holster. practice doing this smoothly. smooth is fast.
to practice shooting on the move, get alot of knee-bend as you walk. walk like you're holding a camcorder and taking film, but trying to make that film have as little shake as possible. do several walks with empty hands, experimenting with your walk to have your hands be as steady as possible. then try with a firearm. steady, smooth walk + good awareness of your front sight will go a long way to making good hits on the move.
then reloads. this is something you can refine alot at home. start with your firearm slide-locked, empty magazine in place. on your weak-side hip, 2 mags, each with a snap cap loaded.
bring your firearm up to target. so at this point, you simulate having just run dry, and the clock starts on your reload.
drop your mag, grasp your spare mag, insert mag, give it a vigorous bump with your palm, drop the slide, return your firearm to target. drop the hammer. hand-rack the slide, and you are ready for another practice run.
remember smooth is fast, and watch that trigger finger. it needs to stay straight unless you are sending a simulated round downrange.
mmm I luv IDPA. if case you want to see a couple mediocre revolver competitors in action, you can see myself and my buddy here:
http://youtube.com/user/parkerlongbow
/after me doing a bit of youtube browsing...
wow, if you want to see someone who's actually good, check this out:
http://www.youtube.com/watch?v=CkKc2w2sPxs
found it by using search keywords 'idpa reload' on youtube.