Growth in technical knowledge, effective self-defense techniques, and rank progression in Budoshin Ju-Jitsu is based on 1] your cumulative knowledge and improvements in performance of kata [forms & techniques] such as hip throw, drop throw, hand throw, wristlock takedown, nerve attacks, shoulderlock takedown, etc., and 2] your ability to apply your learned skills to waza [self-defense] against attacks such as hits, chokes, body/wrist grabs, and weapon attacks. Previously learned forms and techniques are reviewed and applied to different self-defense situations as you progress in the art.
Your goal in going through this process is to 1] develop technique proficiency adequate to meet various rank/belt requirements and 2] to develop a personalized self-defense system based upon the skills you have learned and your physical capabilities.
You are not expected to be perfect in the execution of every technique taught even as you progress in rank, but you will improve in your overall technical proficiency regardless. You will get better as you progress in the art and you will find certain techniques that are more suited to your physical capabilities. You are also not expected to respond to street attacks in the exact same manner as any other student as your technical background, expertise, and training experience will help determine what you actually do in a random attack situation.