One unnerving aspect to career change is leaving safe and familiar territory to take a calculated risk in some unexplored field.
Even with years of experience and transferable skills, it can be an exciting but often nerve racking ride, as you find yourself (temporarily) knowingly incompetent in new skills others have already mastered.
Rather than being too downcast about that reality, I think you should welcome such feelings of insecurity and actual mistakes on the job, as signs of personal and professional growth.
Remember: it’s never crowded on the extra mile.
Be bold and venture forth towards a knowingly competent state of mind.