I also use hand/electric pump first and then use hand, but it is really easy to cause 關節痛, especially on the index finger, therefore be careful. but using hand can induce more milk plus it is real convenient, no need to wash pumps.
I will press on the aerola (edge of the dark circle first) and then from area that I feel lumps and press it towards the aerola for some time, and then back to press the edge of the aerola (just imagine the area cover by your BB mouth).
just practice more and you can aim better into the bottle. I start off using advent, now can do it in pigeon.