First of all let´s assume, (allthough one never should), that you have chosen a good fitting belt, holster and magazine pouches for your weapon. Now, the above is crucial for you to be able to execute a smooth draw, and present your weapon on target as fast as possible.
If your holster moves on the belt, you might not find it at the same location from time to time, thus having to "feel around" to find it, when you should be concentrating on more serious things. If your belt is 1 1/4 inch wide, and your trousers have 1 1/2 inch loops, well, you get the idea.
The same thing applies for magpouches. Choose your gear wisely, and you will find that this gives you a definite edge when it comes to accessing, withdrawing and presenting your weapon.
Now that you have the proper equipment, you can start concentrating on getting your equipment, and yourself, to perform as a unit.
It doesn´t matter if you carry concealed, or in a duty type holster, the first thing you have to get right, is the grip on the gun.
Get a full grip on the frame of your weapon, and keep your index finger on the side of the holster. We will refer to this as "access" in the future.
When accessing, make sure that the grip you get, will allow you to "withdraw" the weapon out of the holster, and "present" the weapon, without you having to change your grip.
You can practice this by starting with just the access part, and when you have the proper grip on the gun, stop and start allover again.
When you "withdraw" your weapon out of the holster, try to get the muzzle in the direction of your target as fast as possible. You simply "rotate" your muzzle forward, as soon as the muzzle of the weapon has cleared the holster.
Stop, and repeat the access and withdraw several times, until you feel that you can do it smoothly. Index finger off the trigger.
Once you feel certain that you access and withdraw the weapon properly, you can start the presentation sequence. Try to get the weapon to the target in a straight line, not pushing down or moving the weapon in a arc. When you stop your move, the weapon should point at the target. You should not have to move your weapon in any direction to be able to see your sights on the target. You can practice this part separately aswell, by simply moving the weapon from the withdraw position straight to the target.
Do the above step by step, and don´t try to do it fast. You will get faster and faster as you practice, but concentrate on the three parts of the draw.
ACCESS ( Get a good grip. If this means that you have to get garment out of the way, do it. You should practice with the clothes you normally carry. Index finger on the outside if your holster. )
WITHDRAW ( Remove the weapon out of the holster and rotate the weapon towards the target. Index finger OFF the trigger. )
PRESENT ( "Punch" your weapon towards the target, in a straight movement. Align your sights. Index finger OFF the trigger.)
When you are sure of your target, and have decided to fire your weapon, bring your index finger to the trigger, and pull it straight to the rear.
Try all of the above in sequenses, don´t try to speed it up too early. Remember, smooth is fast!! And practice, practice, practice.
Boring eh? Not when you see, and feel, the results!!