Parenting is about choices, and sleep "training" is an area that comes with many options. I'm somewhere in the middle of the spectrum; I'm not a fan of cry-it-out methods, but am not an all-the-time-till-kindergarten co-sleeper either.
Many times it depends on the child. My first baby needed to be rocked or nursed to sleep. Trust me, we tried a lot of different things. My second son could be laid in his crib with a kiss and his thumb and he was set.
To complicate things, that can all change as baby's awareness increases. My rock-to-sleeper now loves his own bed and goes peacefully (well, most nights). And my self-soother went through a period of clinginess that peaked at bedtime. You have to be flexibile. Rigidity, again, just leads to frustration.
You may know what you want, but if that doesn't match what the baby wants, no one's going to be happy, or well-rested. I'm not saying to give up and relinquish all control, but just that there are options. So read up, and try a few.
What worked for you? Any magic tricks you can share? .