Pick a pistol. It doesn't matter what kind of trigger it has; learn to shoot it. Most people can only afford one pistol and most of them don't have a choice what kind of trigger it has. Those who practice usually get better, those who fixate on the type of trigger usually don't. SA, DA, SA/DA, DAO, none of it is important if you treat each shot as a unique event and apply the fundamentals every time you pull the trigger. It doesn't get any more complicated than that - unless you want to handicap yourself with trivialities.

Great, thank you! I appreciate your advice.

Simunition conversions work well if you have a big yard and the neighbors won't complain. You can set up IDPA type targets and run scenarios or just a plate rack and have some one call off which one to shoot at. Mother option is to use the shot timer (the one for the iPhone works great, but if you use an iPod it has to be one with a camera or no microphone for it to hear the shots) and shoot the plates in different orders. I.E. 5,8,2,7,3,9,4,1,10 and next time shoot in a different order. This will help in target acquisition since you are not just going down the line. I also like using the"tumbling" targets. Just make sure you are not shooting in a situation where ricochets can be an issue since you will be shooting at the ground.