Based on my own experience I find it easiest by saying things as you do them.
Say, when you uncover your bird of the morning, asuming you cover her of a night, say Goodmorning(Or hello, g'day whatever you want, just nothing to hard to begin with.)
give her a second to process what you said then do it again. do this ten or so times, and say it enthusiasticlly, this encourages them to copy, do this everymorning untill she begins to ramble while you do it. when she does this treat her and say goodmorning again encouraging her to continue.
This might take a while, more than a month even, but once they get their first word, the rest seem to become easier.
Just from repititon Tilly says step up. and it is quite funy cause she'll go "Good mornin good girl, *whistle* step up stepup pretty little girl, good, silly tilly,c"mon step up.." ect. She just mixes up all her words to make a story. Its pretty cute.
Best of luck and hope this helped!