jonny: Best way to learn proper technique with a handgun is to learn by shooting a .22. There are some excellent pistols out there, like the Ruger Mark II, that fit the bill. You can purchase targets that show, based on where the round is hitting, what you are doing wrong from a technical standpoint (i.e. yanking the trigger versus squeezing, anticipating recoil, etc).
I would agree that shooting .38s is more inexpensive and certainly less punishing. However, once you acclimate yourself with the weapon, switch to the rounds you are going to use in a combat situation.
Problem with range shooting versus combat shooting is that range shooting teaches several bad habits that can prove fatal in combat. The reports that followed the Newhall Massacre more than adequately cover this, and illustrate the dangers of spending too much time on the range. If you are interested in combat shooting, put yourself as close to the actual situation as possible, including shooting in low light and sublight conditions and without hearing and eye protection. Learn different styles of shooting, including point shooting and instinctive shooting.
I concur completely with the recommendation of going to a good combat school and learning. No disrespect intended, but I’ve spent a considerable amount of time on ranges and the idiot to professional ratio is disproportionately in favor of the former.