When my children were young and I was trying to keep them safe from harm, I repeated to them often, "There are four powerful things in the world: Your mind, your tongue, guns, and cars."  It was a simple reminder that we must grow up in mastery over powerful things, so that we can learn to use them to love others rather than to hurt them.  I think my kids could still quote the mantra back to me, even today.
When my students enroll in my classes, I intend to do more than just deliver specified data into their ears and eyes.  I intend to offer them keys to their own powerful vehicle, and coach them to drive their own learning with growing mastery.  When I do, I've seen my students respond in three distinct ways:
1. Some students take the keys, fire up their vehicle, and drive immediately into a ditch.
2. Fearing the ditch, some students panic at the sheer power offered to them, and refuse to take the keys.  Often, these students will request (or even demand) that I drive for them.  This option, I will calmly refuse.  
3. Some students receive their keys with gratitude, recognize the ditches, fire up their vehicle, and learn to drive masterfully.  These few are now equipped to explore breathtaking destinations.
I'm not only teaching a topic - I'm teaching them how to learn.  - c

"[W]hen He, the Spirit of truth, has come, He will guide you into all truth." - John 16:13

One of the books I like to use in helping students to find their own initiative and grit is James Clear's, Atomic Habits.  It is one of the most pithy and quotable books of its kind, and it offers very practical helps for people trying to create change in themselves.
In the introduction, Clear states, "As long as human behavior is involved, this book will be your guide" (p.10).  A confident claim, to be sure.  And it begs the question, If I am a Christian, should I trust this kind of advice?  Don't I already have a guide?  Indeed, you do.
For all Believers, the Holy Spirit lives in us, and - as Jesus says to His disciples - He will guide you into all truth.  Am I to take it that I should then refuse to hear others who claim to be guides?  I don't think so.  Instead, I practice and recommend that all we absorb and engage should be placed under the supernatural guidance of the Holy Spirit:  Almighty God and Father, I ask that Your Spirit would help me to see and embrace truth, and to discern and reject lies.  I trust You to do this in me by Your Spirit, because of Jesus, Your Son and our King.  And Amen.
The book, Atomic Habits, may be a big help to me and my students.  And I pursue all good things under the blessing of God, including the perfect guidance of His Spirit.

I like to use variable-challenge assignments, or as some like to call them, "Goldilocks" assignments, to help align student confidence and motivation with the work to be done.  When designed properly, the student can maintain interest and forward motion through the use of these "Goldilocks" assignments without falling into boredom or panic.  Not too hard, and not too easy.  Just right.

​An Example
In teaching jazz improvisation, for example, I might create an assignment with five layers of challenge to it.  It might look like this:
• Find the 3rds and 7ths - the "goal tones" - of each chord given.
Part A, for one point: Name the notes that make up the goal tones of each chord.
Part B, add another point: Submit a recording of your performance of the goal tones of each chord on any instrument.
Part C, add another point: Submit a recording of yourself singing the goal tones as a backing audio track plays the chords.
Part D, add another point: Submit a recording of yourself performing a prepared melodic line that uses goal tones over the backing audio track.
Part E, add another point: Submit a recording of yourself performing an improvised melodic line that uses goal tones over the backing audio track.

Every student in the class would required to engage the assignment at some level, but those engaging the level at which they are stretched without being overwhelmed find additional rewards in accomplishment, learning, and equipping for new challenges.  For high-achieving students, I can also offer an optional certification or endorsement for those consistently completing assignments at the most challenging level. 

Student-directed learning like this can optimize anyone's progress, while still providing accountability.  - c