NannyBug, I found your photos in the other thread, you had great results too. Almost makes me want to run out and get it done! My skin looks a lot like yours did before you started, but I have more veins around my nose. I thought about getting treatments done in sections, is that common? Like start with the chin, then the nose, etc, so the effects are hopefully not as intense? Or is it better to just go for it?
Only my first treatment was full face. The second treatment was above the brows, mid-forehead, cheeks and nose. Third was the same, except with purpura. Fourth was mostly forehead and nose with treatment to the apple of the cheeks. I'm planning on a fifth with just the nose and forehead.
To answer your question: yes. They can do it in sections. In fact, if you're really concerned, have them do a test spot first. See what happens. And if no adverse reaction, then just go for full face with purpura. The recovery time from the first treatment takes the longest.
To minimize post-laser swelling, I used 1% hydrocortizone (Aquanil HC lotion) full face two times a day two days prior to treatment. Make sure you get all the lotion off before the treatment. Be sure your face is CLEAN prior to laser. Oh, also, don't flush yourself prior to treatment. My laser tech told me there's no evidence to suggest that yields better results.
I'd get it done through a dermatology clinic, not a plastic surgeon or some beauty center. An experienced laser technician is OK. Mine was an RN certified in laser who worked with a dermatologist. They have such a high volume of laser that they had to use techs. I also used the Perfecta laser by Candela. It's the best pulsed dye laser out there presently.
Good luck! You'll be fine. Just remember ... LONG TERM results are what you're seeking.
I should also mention that after laser, don't be dismayed if you get these strange lines in your face after the swelling goes down. It will almost look like craquelature (not sure of spelling) or wrinkling. That will resolve over several months as it fills in with collagen. Just use lots of moisturizer for the first few months afterward.