i was looking at a .22LR pistol for a bit. here's where such a plan goes wrong in my opinion. i have shot pistol before, a very limited amount, but i have done it. recoil doesn't phase me at all, i have no flinch etc. i'm a very fast learner, especially when it comes to hands on skills like shooting. with good instruction i won't have a problem learning the basics and improving myself.
and one of the biggest reasons, i'd get bored too fast with a .22LR. with no challenge of controlling recoil, i'd be starting to shoot too fast and if anything would rush through the practice, totally defeating the purpose of starting with a .22LR.
starting with a 9mm would force me to focus more on technique, thus keeping me from blazing through rounds. i did this with rifle, learning to shoot with a 7mm Rem Mag, and then buying a .22.
maybe i'm bass ackwards, weird and/or out to lunch, but i feel that although a .22LR would be a fun toy, it wouldn't help me to build the basics due to the lack of challenge.