Have you ever tried to learn a simple phrase in a foreign language? Perhaps you were planning on visiting another country and you needed to learn it and most likely other phrases that were critical for communicating things to the locals. In most cases like this, we tend to learn just enough to get by.
Getting by might be acceptable for simple trips, but what if you planned to move there and really immerse yourself in the culture long term? If you really want to be accepted and build strong, high quality relationships with the people there, you'd probably take learning their language much more seriously. Let's take it even further and assume that you want to learn the language to the point where even locals can't tell simply by hearing you that you're not from the area. With a goal like that, there's really no room for error. You'd literally have to talk the talk on a consistent basis.
Of course this may all seem very daunting for someone who hasn't learned a lick of the language yet. However, if you were to focus on simply one word and repeat it incessantly until you get it absolutely picture perfect you'd be hard pressed to ever get it wrong again. If you truly want to master scratching your goal should NOT be to simply get by. It should be to express yourself in the most fluent way possible 100% of the time.
A Big Piece of the Puzzle
This method of isolation that I alluded to in the previous example is a big part of what it will take for you to overcome your challenges in scratching and ultimately perfect your scratch technique. I refer to this method as drilling and if it's not a part of your current practice routine it should be. If you are faced with a challenge in a specific technique, random freestyle scratching and occasionally throwing that technique into your soloing will likely make it take much longer if not impossible to ever get past the problems you're encountering. When you drill a specific technique in isolation you are effectively shutting out all distractions when scratching and allowing yourself the chance to really get to the bottom of what is holding you back from improving.
Taking Things to Further Extremes
In fact it is possible that you may only be struggling at one aspect of a technique. In this kind of situation, you will need to isolate things even further and just drill that one aspect of the technique that is preventing you from performing it correctly. Perhaps things are worse for you and you just aren't grasping the technique at all. The strategy of extreme isolation is still the best way to approach it. Only now there are multiple parts to the technique that need to be broken down into their own specific drills before you'll be ready to put it all back together again and drill the full technique without such severe isolation.
Different Drills for Different Needs
While the above drills work well for techniques you are suffering big problems with, they don't necessarily work for other issues such as phrasing. When phrasing you are stringing together a group of techniques to create something where all the techniques sound like they're really meant to go together. Individually you might seem to have no issue performing any of the techniques you want to use in the phrase, but things tend to fall apart once you begin combining scratch techniques.
There are many reasons why this may be so, like timing, rhythmic feel, and contrast in speed or pitch as well as many other possible challenges. A great way to approach such a problem would be to isolate your phrase to only two techniques at a time. Work hard to see what approach will be best to make the transition from one technique to the next to sound the smoothest. Then once you feel you've achieved something you're pleased with, add an additional technique to the phrase and drill that. Often times it's the transition between one scratch technique to the next that is most difficult so you will likely have to go back to extreme drilling. Only unlike extreme drilling with a single technique, in the context of a phrase you would be drilling the transition only.
While drilling is mostly best for getting past major challenges it can also be used to refine scratching that you aren't necessarily struggling with, but are getting close to mastering. This goes back to just getting by vs. perfecting things. Drilling something that you can do well, but haven't mastered will lead you to mastery much quicker than you would otherwise.
Making the Most of Your Practice Time
Keep in mind that items that you are struggling with most deserve much more practice time and things that only need refinement deserve much less attention. If you put too much effort towards drilling practice items that only need refinement you stand to progress at a very slow rate. No one wants to intentionally slow their rate of progress down so be sure to avoid allocating improper amounts of time to what you practice. While it is not impossible to judge what deserves the most vs. the least attention during practice, it's not necessarily easy either. If you need help designing a practice schedule that fits your needs and the amount of time you have to practice throughout any given week, be sure to visit this link: Scratch DJ Training