jang,
what i did with the pacifier when i introduced it was to nurse yee heng for a while, then do a switch to the paci.....
even now i'm sure he prefers the breast to the paci, so when i put him to sleep, i carry him lying down so his face is close to the breast, and give him the paci whilst my arm is lifted slightly higher so paci is semi-wedged with my boobs (requires a little maneuvering!)
when i did yee heng's sleep training,i'd make sure he's nice n full already (full feed about 1 hr ago)..and watch out for his sleep cues, i.e. yawn, rubbing his eyes..if there aren't any, i just watch the clock n if he's been up for 1 1/2 hrs, i start to put him down for bed..i swaddle, switch off all the lights except a bedside lamp, cuddle and hold him whilst singing a lullaby..then if he's rooting around, give him the paci..usually by this stage he's got his eyes semi-closed and nodding off..but not yet fully asleep..then i say good nite n put him in his cot(still has the paci in his mouth the whole time)...if he fusses, i pick him up and pat him on his back/bum (watever i can reach depending on carrying position!) then when he's calmed down, put him down again in his cot and turn him on his side n continue patting until he's completely calm..
in the early days, i'd prop a lil bolster close to his face to put the paci in place cuz he kept spitting it out accidentally n then waking up n fussing...now tho, he'll suck for a while then spit it out himself n go back to sleep...
be strong! initally when we were doing this, it took a good 2 hours for me to put him to sleep..n i'd have to feed him again cuz he'd be hungry AND tired after all that time..and now its 10 mins or less!