Does sleep training always work?

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DD is almost 6 months and since the day she turned 4 months her sleep has been awful wakes 5-10 times a night and is now refusing to be put down at all in her crib. We have tried everything and are at rock bottom so have now hired a sleep consultant and we will likely do some sleep training next week with their support.

My question is does sleep training always work? DD gets so hysterical if you leave her in her crib as she has always fed to sleep and can't self settle. She does not take a comfort from me patting or shushing her in fact it makes her crying worse, so I am concerned the sleep training won't actually work.

The method we will likely be following is where you stay in the room with them and offer support (sing, pat, talk etc)

Has sleep training ever failed for anyone?

I agree Ginny B, I was just disagreeing with the person who says all sleep trained kids end up worse later on. Some kids sleep through from a few weeks old, some need help and if they don't get it they remain in their parents bed. My poor pal now has a 4 year old in bed with her and her partner and they can't see a way out. . .
And for a few, sleep training just won't work, but that becomes apparent within a few days of trying.
It just so happens that me, my pals and my family fall into two camps of either sleep trained and sleeping in their own room, or not sleep trained and still in bed with parents aged 3+.