In the beginning every action seems odd, out of place, every note feels alien and out of control. With practice, one tries to translate will into action. With practice one learns which actions are feasible and, consequently, what to aim for.

Playing an instrument requires the use of very fine motor skills or dexterity. To acquire such skill, the brain must be challenged consistently and repeatedly by the same proposals, leading to a self induced auto-restructuring. This transformation is not a trivial one and it only comes to be after all the necessary work has been done, and enough time has passed.

It’s all about consistency and time.
Practice consistently and allow enough time for the brain to adjust. Consistency makes the challenges persist, which tells the brain a change is needed in order to solve them. Even when you are resting, your brain will assemble new structures to handle those needs that your consistent practice routine has created. Practice every day. It is better to practice 5 minutes every day than 5 hours once a week.

Don’t forget that it takes time for those structures to become functional. Sometimes your playing will seem to worsen or you will hit a wall. Don’t get frustrated, allow your brain enough time to find a way around that wall, if you keep practicing, that will eventually happen and you will be cruising into your next challenge. Do your part, practicing every day, and your brain will find its own solutions.

Organizing your Practice routine
Any practice routine must be consistent, organized and must evaluate progress. Probably the most common reason any practice routine fails, is the lack of organization. You must know how many topics you’re practicing how often, how much time per session each, where you have improve and where your areas of weakness are. Always take your time to write down all pertinent information for each exercise or topic you have practiced.
A good record keeping system is essential for your practice routine to success.

Buy a notebook or get a workbook for musicians like the one mDecks offers with 52 assignment sheets for musicians base on an organizing system of four topics a week that will last you for the entire year called:
52 Weeks of Practice.