Pistol Shooting

How to shoot a pistol accurately

The main thing is to add dry fire training.

Glock E-Trainer
This might be worth it when you consider the cost of ammo if you own a Glock.  Just using it for a week of practice could justify the cost in my mind. 

A better answer might be to get a trainer pistol or even a BB gun with a realistic trigger pull minus of course the short Glock reset.

Here is my suggestion.

Daisy Powerline 415
With this BB pistol you can get live fire practice with C02 powered BBs.  It has a full length reset more like a double action but other than that it is very functional for practice.  You can also use it for dry fire practice but keep aware that as a plastic mechanical device with springs it will eventually fail with too many trigger pulls and if not that the air system will eventually fail.  It all depends on how often you use it.