If you don't mind advice from someone who was a cinematographer and taught film-making for 29 years:
Visual:
Although you hand hold the camera well, think about using a small tripod for really steady shots.
For 'single purpose' training type videos, consider using freeze frames so that the viewer can study what has happened in a multi part action.
Sound:
As others have mentioned, your voice over has too much delay (echo). Note that you will get your best sound quality when you place the mic close to the source of the sound. If possible use a more unidirectional mic. Also, given that you don't have access to a sound booth to record in, and this may sound silly, but record in the smallest room you have (usually the toilet) and throw some blankets around in there to absorb the echo.
Contact me via email if I can help solve any other problems.
Cheers