My apologies for sounding simplistic in this post, but it really is simplistic. My very first rifle I made I had never had any carving experience, so I thought I would try to practice it first. I took a piece of maple I had cut off of the stock, and drew at the time what I thought was a simple design, and started carving. Having never tried this before, I impressed myself with the results, but was not satisfied with them. So I got another chunk, and did it again with a slightly different design, and it was quite a bit better, but not satisfactory for me. Had I visualized it wrong? No. Was my design wrong? No. Was my carving poor? Yes. Then I got another slice of maple and started to draw...
It was then I tossed the practice blank to the side and drew my final design on the gunstock. I then started to slowly start, taking away what would be the lowest areas first, not going to full depth with my first pass. I figured it is better to creep up on it than to regret taking too much. It took me a couple of weeks to do, but I did it, and it came out pretty good. I still have that rifle hidden in a dark corner of my dungeon.
Our first attempts are never our best work. Our second attempts are rarely much better. But if we are going to get good at anything, we have to practice at least a little. If I practice the violin for an hour a day, I should be acceptable in a couple of years. Maybe in five years people would like to hear me scratch out a tune. It is no different than carving, really. Learn the wood in your stock... Learn how it's grain changes. Learn to make razor-sharp chisels to handle that wood. Then carve it.
Matt