John
You're doing fine. Just go slow and remember that you don't need to go to finished depth and detail with the first cut. Indeed, for those of us that are amateurs at this it is often better to cut very shallow and see the overall look before going to finished depth and starting the model the shape of the carving. Remember, too, that the best carving is deceptively shallow - a 32nd of an inch deep - the thickness of a regular paperclip.
I find that it goes better for me if I try to work on the whole rifle all at the same time. Much of the carving is interconnected on a long rifle and I like to get the feel of the whole design all going together in the same direction, so to speak. Work on one side, then the other , then over the wrist at the nose of the comb and then back to the sides so everything gently progresses to a single internally consistent statment.
I don't often achieve that, but that is what I am striving for!
Best Regards,
John Cholin