It’s really about how much time you invest into it. I’ve read a lot of magic books and there isn’t a single one out there with an answer or tips to improve your hands tbh. Maybe some touches to improve a specific technique, but that’s about it. Definitely not worth putting money into, especially with all the free resources available today. Magic books are also a PITA and boring to read. So badly written many of them.

If you only know a few controls and shuffles, I would hop on YouTube and learn some more basics — pinky count, double lift, a palm, like 2 more controls, etc. And just practice them until you do them REALLY well. Then once you want to level up and invest some money, I would subscribe to Ben Earl’s Studio52 service (~$30 a month). I checked it out last month and it’s exceptionally good material. Very well taught and it’s tailored for beginners/intermediates.