Hello, I'm pretty new to this slot world, but have recently been working on my own Game King. From what I've seen changing denomination can be done with the keychip at the same time as you do your TITO install. As for performing the set up, it depends on how the machine's current configuration is set and how picky you are on your payout percentage. In order to have $.25 games show up, two pieces need to be in place. The denomination needs to be selected and games have to be assigned to the denomination. In many cases games will be assigned by default to many denominations and choosing a new denomination is sufficient. However, when I set mine up I tend to clear the denominations I don't want on the game and then reassign the payout percent I want for each denomination that I plan on using. In that scenario I'd have to go back into each game. If you have a machine that takes nickels, you would also need to change physical components as well.