I did several things to practice..
I would start a Exibition game against a highly rated team, then from the word go try hit every ball for 6..
Then I'll play another match and try make as many runs as possible without using the 6 hit button or charging down the wicket. I just used front and back foot shots.
Next match i would only use the charge down wicket button, no 6 hit button though.
After practicing these types of matches several times I got the hang of things and worked out what shots work and what ones don't. And I also worked out how hard I need to push and when. Since I did this i have won all 3 50 over matches I have played, although not by much but atleast it was close and more fun that way.
I find the nets hopeless as the conditions are different, what I also done during these matches was practiced different conditions as well.