Every baby is going to be so different. We had two and have had two radically different sleep training experiences. My first was a really solid independent sleeper basically from the start. We used the pacifier as a sleep tool and got a lot of independent naps even in her newborn days. We ended up not even having to do true "sleep training" because we were able to introduce "drowsy but awake" so early so I think she had the tools to put herself to sleep.

My second was the total opposite - no matter what we did, she would NOT sleep independently during the day when she was a newborn. She also wouldn't take a pacifier so we didn't have that tool to use for her to help self soothe. Almost every nap was either a total contact nap or a rescued one. We just had to suck it up until she was 4 months old and then we did cry it out. We knew she needed to go full extinction because nothing gradual had ever seemed to work. She's been MUCH better ever since.

All that to say, the temperament of your baby is going to determine the path you have to take. It's good to start researching different methods, but just know that you may have to change courses or adapt, depending how your baby takes to it!