Just do alot of approaches high up on the first few flights. Resist the urge to do a bunch of stick banging, and see how the plane reacts at slow speeds at least 1-2 mistakes high. You can watch and learn what the plane will do consistently, and more importantly, learn the SUBTLE inputs that will help you anticipate and reduce the likelyhood of a spin, as well as increase your chances of recovery. If others are flying the same plane, or others similar in size/performance, watch them on approach. See what works, see what doesnt. Ask questions, ALOT of questions. Have a highly experienced pilot test fly it if youre not comfortable with taking it up the first time. They can also check the balance, throws, etc. Setting aside your pride has saved many airplanes.
Good Luck,
Steve