I would say sit with the cards and really feel them--trust them and trust the guidance from yourself (God, angels, spirit, whatever you acknowledge) when you read for yourself or others.
The biggest turn around for me in terms of reading for others (which I recently got into doing over the last year here on LL) was learning to trusting the deck completely! There are still times when I give the deck the side-eye, but I always say, it's me, not the deck! There are not hidden agendas with the cards, just the person reading them.
Also, I call upon angels to help me with the reading and also to guide the answers. That was the biggest turn around for me also.
Don't put too much pressure on yourself either....as you trust yourself, you will then trust the cards, and then finally the interpretations you give the cards! Do not rely solely on the originally meanings of the cards either; they can speak to you and you develop your own language with them. Soon, you'll have your own relationship with the cards :-)