I'm doing the exact same thing right now!
Just put Salsa Short-n-Shallows on my bike on Wednesday, still trying to move my hands back, so I'm getting a taller stem with a shorter reach.
Mine is a quill (like LisaSH has), so it is a bit different than yours.
When I bought my bars, the LBS ( www.recycledcycles.com ) told me how to change them and told me to bring the bike in when I was done and they'd check my work.
They checked my work and said I did it right. I knew at that point I was still going to need less reach and more height, and I had a contact with a used stem that would fit. So I asked the guys to explain to me how to switch that (they did). After I do that, I will again take the bike in if I feel they should check it. Actually, I feel like I can do it myself ok and unless I'm really worried I probably won't bother them until my next "legitimate" shopping trip. (to buy tires)
Those Ritchie adjustable stems are very nice, especially for fussing with fit! I test rode a Jamis Aurora with one, and it was cool to have the bars instantly adjusted to my preference just for the test ride!
At least with the "modern" stem you won't have to unwrap half the bar and take off the brifter and work the bar through the stem and out to change anything.
Did you check the Park Tool website? I like their online instructions and I love their book. www.parktool.com



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I read the article on threadless headset adjustment at Park Tool and it sounds about as I figured. I could probably do it myself, but I'd be paranoid the whole time of not adjusting it properly. Better to leave it at the shop and have someone with experience take care of this, just in case. 
