Taking cara babies course

Is it worth it? I got the 3-4 month course a while back and it was kinda helpful but I didn't really do much if it. I didnt feel like the moving the sound machine thing closer and all that seemed useful. But now I'm feeling like I need to sleep train. My baby is not sleeping longer than 45 min in the crib. I need to teach him how to sleep longer without waking up screaming for me to nurse him. I dont mind 1 or 2 wakeups per night but I just can't keep on with what I'm currently doing.

So is the 5-12 month course different or pretty similar to the 3-4 month one? It is kinda expensive so idk if I should worry about it or just do my own version of check and console.