Considering this sport, any advice?

First topic message reminder :

I have no experience in competition shooting.  I have no delusions of being a superior pistol shooter.  My goal is to participate in the Hunstman Games held in southern Utah. The Games are in October. By then I want to be able to hit the black with 75% of the shots fired and hit the bullseye with 15%.

I shot at a local range and I can hit the paper at 25 yards, sometimes in the black.  I use a Ruger Mark IV.  I ordered the Volquartsen PISTOL COMPETITION KIT FOR MK IV. I am considering the Volquartsen upper assembly, including their bolt.

I am also considering the Hi-Viz front sight.

To reach my objective will require practice, and money for range fees, ammunition, and pistol modifications. I'd like to present some questions with the realization and there is no specific answer to these questions because you have not seem me shoot. I shoot right handed and seem to be left eye dominate.

I wear progressive glasses.  The achievement of the proper sight picture is near to impossible.  I read an article written by a doctor of Optometry who is also a shooter.  His solution is to have new glasses made with the lens for the dominate eye focused for near vision, at the distance from the eye to the front sight.  The other lens is focused for far vision. 

1. Is my goal realistic in the time frame I have allocated? 
2. What is your opinion on the Volquartsen upper?
3. 4.5" barrel or 6" barrel? (If I choose the Volquartsen barrel)
4. Do you have experience, either yourself or someone else, who wears glasses like I described?  If so, what are your opinion on glasses in this configuration for target shooting?

I would go to this site and read all of the articles.

Encyclopedia of Bullseye