We had the same problem when dd was 16 weeks and we went cold turkey. It is entirely possible to do it without using Ferber (which is cc) unless you want to.
It took 3 days for her to forget about it (which is apparently standard for this age -should apply to your baby too.
We started first thing in the morning for her first nap. I sat with her for 20 mins while she cried and then she fell asleep. The plan was to sit with her for 20 mins, leave for 5mins, back in for 10 mins, leave for 5 mins and if she wasn't asleep by then, to take her her for a walk (to make sure she got sleep and was not overtired).
At her lunch and afternoon nap, we took her out in the car/pram.
Beditme, same as morning. Sat with her for 20 mins, left for 5mins etc. Apart from the last night, when it took about 40 mins for her to fall asleep at bedtime without the dummy, she fell asleep within 20 mins.
By day 4, she had totally forgotten about the dummy. 4 days later, she started sleeping through the night from her dreamfeed.
It was the best thiung we have ever done - and we were all dummy addicted.
DD was waking up all the time looking for it and no-one was getting any decent sleep.
Whatever you decide to do, I hope it works out but I just wanted to tell you our story because I was terrified about getting rid of it. I hate dd crying and using the dummy meant that she had hardly ever needed to. The way we got rid of it meant that she hardly had to cry by herself (apart from for a few mins) as I was with her the majority of the time).
Since we got rid of the dummy, she can self settle herself and goes straight down in her cot smiling and is asleep within seconds.