hi Shotokan-kez, I know bought katas: nijushiho and jite. With jite I didn't have any problems but at the begining of nijushiho, well i had problems too. I learnd nijushiho by segments and with all that i had problems with my kata but then after many trainings i started to memories the hole kata ... then i had a problem that not all man consider it important but if you ask me it is so i didn't finnish the kata from were I started so that was my last problem and it took me some trainings to finish it at the same place ... some of my positions were to large and others were to small... then I tried it again and everything was (almost) perferct ... I say almost because you know, you always learn new things in karate and you never reach a stage were you can say: ,,OK, now I am perfect, the best, in Karate so I do not need so much training i can have 2 trainings / week instead of 3 "... at the first time I hated nijushiho but now it is my 2nd favorite kata (the first is empi)... In conclusion: if you train a lot and focus you will understand a lot more easier everything in karate just be patience... Samurai.