you can use bridge size card
I would disagree with this. I think that you should use poker cards so that you get used to them.
I don't think your hands are too small though. My hands are small too but unless you have the hands of a seven year old, it should be fine.
try to do the thumb cut with poker size, if your hand is to small you won't be able to do it! unless you change the size on the cards
i don't know where the problem is to use bridge size cards, just ego