Age to start Sleep Training?

Au

My baby girl will be 10 weeks old on Wednesday, so far she's been bedsharing with us and will not sleep in her crib or the pack n play beside our bed. I've read that I can gently sleep train now (I'm thinking of a happy medium between the Farber method and the no cry method), where as other things I've read says not to until they're 4 months or older.

If you did sleep train (regardless of the method you chose), how old was your baby and do you have any tips to offer? I just want to be very informed before diving into this, because I dont want to get halfway through an awful night just to change my mind about how we're doing things.