my bb also uses tt bottles. she can now hold it herself at 10 months. why do you want to train her to handle the bottle?
if you want to, use the combi cup la. My bb started to use the combi cup stage 2 around 7 months and stage 3 at eight months, she handled it very well.
but i agree tt has its problem e.g too big to fit in other container for warming it. I'm now switching to B Free cos' my bb still has burping problem.