It depends how comfortable you are with a complete disassebly of your pistol. I just converted my 229 to the DAK trigger system and it is pretty straight forward but it does involve completely stripping your pistol. The only part that you don't have to remove is the mag release assembly.
You will need : A DAK Hammer
A DAK Hammer Strut
A DAK Main Spring
A DAK Safety Lever
A DAK Sear
A DAK Sear Spring
A DAK Trigger Bar.
Don't forget to take the hammer reset spring out as it is not needed for the DAK Hammer.
If you just want a DA pistol you need only replace the hammer with a double action only hammer and remove the decocking lever. If you have tried the DAK system though it is far superior to DAO.