I was also between those two.  I figured that the AP1's were more forgiving, which helps make up for my lack of time to actually practice.  I do like the 2's quite a bit but figured the added forgiveness would be better, for me.

it is fairly easy to do, use the tool and unscrew the shaft then you can take it out and replace it. be careful not to force the shaft as they are somewhat delicate. but with a few trial runs you should get it down easy.

Hi Bart - 

Titleist did not release an AP2 2iron.  There is a 2 iron available in the CB only.