I can do all things [which He has called me to do] through Him who strengthens and empowers me [to fulfill His purpose-I am self-sufficient in Christ's sufficiency; I am ready for anything and equal to anything through Him who infuses me with inner strength and confident peace.]~ Philippians 4:13 AMP
You may not be giving full measure to this process. You may only be saying you can when you come over here and that's only when you remember. That type of attitude and focus will never get you great success in any area. Anything you only do once in a while, you'll never master.