A lot of what's been said is top notch. For me, I was sort of a late-bloomer. For YEARS I played around B-speed only to find myself obliterating the B-field one day. It literally happened in the span of a year. Afterward, when my ranking was finally realized, people were asking me left and right how I did it. The truth is, it boiled down to two aspects - planning and execution.
You first have to devise a plan and that plan should be VERY specific. You obviously want to pocket the ball but where do you want the cue ball to go? If you're going to hit a couple of rails, where do you want to contact the first rail? What kind of angle do you plan on getting for the next ball? Is that the correct way to get that angle or is there a better way to go?
Then, you have to actually do it. So many times, I see reasonably good amateurs miss routine shots. In fact, I see it happen with some of my region's top players. You have to devote the same level of concentration for every shot no matter how likely you are to make the ball. A shot you should make all the time has to translate into a shot you actually do make all the time. When you do miss something you shouldn't, you have to figure out why. That's a hard question because the reasons are aplenty. Try finding a friend who is good enough to figure out what might be wrong and if you don't have one, find an instructor. If all else fails, get a video and upload it here. There are plenty that can help you on this forum.
You first have to devise a plan and that plan should be VERY specific. You obviously want to pocket the ball but where do you want the cue ball to go? If you're going to hit a couple of rails, where do you want to contact the first rail? What kind of angle do you plan on getting for the next ball? Is that the correct way to get that angle or is there a better way to go?
Then, you have to actually do it. So many times, I see reasonably good amateurs miss routine shots. In fact, I see it happen with some of my region's top players. You have to devote the same level of concentration for every shot no matter how likely you are to make the ball. A shot you should make all the time has to translate into a shot you actually do make all the time. When you do miss something you shouldn't, you have to figure out why. That's a hard question because the reasons are aplenty. Try finding a friend who is good enough to figure out what might be wrong and if you don't have one, find an instructor. If all else fails, get a video and upload it here. There are plenty that can help you on this forum.