Oh, do I hear you there! Two years ago I decided to get more serious about learning golf instead of just going to the range, and hoping I'd break a 100 once in a while. So I signed up for Golf Tec, and did that for close to a year. Man, that was a waste of time and money. Swing maybe 10 times during a lesson and nothing that I could actually repeat. It all looked pretty good by their rotation numbers, but still hitting the ball fat most of the time. Very frustrating. During one of the practice sessions I started experimenting with keeping my weight more forward and the results were encouraging. Still, it felt a little like cheating on my instructor. After the lessons were finished, I decided enough was enough and clearly this swing was not working. I saw the S&T; commercials on TV, read the Golf Digest article and went to the range. First ball I hit (6 iron) went a 170 yards (maybe 140 yards before) and the compression felt fantastic. I was hooked like never before. About 5 weeks later I broke 90 for the first time. Gone was the slice, and suddenly there was a nice draw.
Due to a lack of playing, I did stay stuck in the low nineties and then earlier this season I picked up the S&T; book again (I had a copy last year but gave it away to my dad who needed it too!). In addition to the book, I bought the TourStriker Pro (7 iron) and The Impact Zone. While my rounds are still seesawing, I am pretty consistently in the mid to high 80s now. Yesterday I played 9 holes at my new club, and shot 40 for the first time in my life. I've also been reading the Stan Utley's short game books, which has helped immensely. Read the S&T; book for sure. For $10, the Impact Zone is worth reading I think. Both books helped me get a much better understanding of the swing and ball flights. I can actually work the ball a little now, and enough to get around most trees.
As for range vs course, I think the main difference is that on the range it is easy to focus on your swing and not worry about the ball. Target, swing, success. On the course, I find I generally stay too focused on the ball, which causes the swing pattern to change dramatically from the range. When I don't focus on the ball and just focus on a smooth takeaway, it takes care of itself. Easier said than done though.
Anyway, I agree with the other post that said that thinking 'you suck' versus 'what can I learn from that' is another key ingredient. Obviously we want to score well, but I'd suggest playing it one shot at a time. Thinking it through, hitting it and learning from it. Then, regardless of your score, you are playing golf instead of merely scoring golf. You'll have more fun and the scores will start dropping as a result from learning.
One final comment re S&T.; The last few weeks I've been playing the Nullarbor course in Australia with my dad. He's not a great golfer (100-110) but he was hitting the ball pretty straight all week, just no distance. When we got to Perth, I asked him if he would indulge and go to the range and try S&T; for a session (he never read the book I gave him!). If it didn't work, he should forget all of it and go back to his normal (not terribly effective) swing. As we got the range, I had him a bunch of 5 irons. They went 125 yards on 'good' hits. I took a video of it, and he had a massive weight shift to the right on his back swing. So I started with him trying to start more centered. After a few shanks, he hit one solid. It flew 160 yards (I know, nothing spectacular but major improvement nonetheless). As we followed through the steps, he started hitting nice draws. I added the tee in front of the ball, and he started compressing the ball. Within 15 minutes, he went from hitting 125 yards to consistently hitting 175 yards. I think it was the best birthday present I could have given him because he was grinning the remainder two days of my visit. We played golf the final day, and although his score did not magically improve overnight, the quality of his shots did. One of his friends joined us and said he'd never seen my dad hit the ball so well.
I know this forum is S&T; heavy - and with good reason. I spent thousands on instruction from PGA professionals to little avail and just more frustration ("I have all these lessons and I still cannot beat my friends!"). The $25 for the S&T; book is the best investment you can make, and it will improve your game and enjoyment. Good luck!