Here's the answer from a beginner, sort of. I took three lessons this April. By the end of the season I was shooting about 8 over after playing only like 9 rounds during the summer. How'd I do it. Hitting balls at the driving range three times a week and hitting them mostly correct rather than like so many people who go to the driving range to clobber the balls, and along with that about 1-2 hours on the practice green chipping and putting. And now, during winter, I practice every day, indoors putting and chipping. Next summer I hope to get my handicap as close to 0 as possible. I'm sure you can get under 10 with no problem. And I so much agree, you must have an instructor you really like and believe in as it gives you the motivation to do better.