Just keep doing it. One of the easier ways to get "good" at it is to learn the symbolism for the cards, rather than remembering specific meanings for each card. Colors, various objects, directions peoples face, animals, numerology, astrology, and the MBTI all come into play.

I'm saying this as someone who believes in none of this, I just think it's fun. I have my notes somewhere, I can upload them later if there's interest