When to start weaning from bottle?

Baby will be 1 in 4 months!! 😮 He’s still getting the hang of sippy cups/open cups—lifting at the right angle is still a challenge.

I’ve been having him hold his own bottle more (sitting/laying at an angle since sitting up with it is too tricky right now), but he definitely prefers for me to hold him and to hold the bottle. I’ve also tried offering his milk in a sippy cup, but he wanted his bottle back.

I know 4 months may seem like a long time, but is anyone trying to slowlyy transition? Or any tips from second time mamas on timing/how-to?