Gregory nailed it in one.
If you're confident in your rifle, if you know where it will hit, and at what range, if you're well practiced, you'll be fine.
Don't do like my co- worker did last season. He came up to me at the end of last season and asked if I knew anything about flintlocks, and when I said that I did, he regaled me with his tale of woe about how he'd spent all this money and they were no XXXXing good and so on. Come to find out out that he hadn't even bothered to clean it: he just took it out of the box, took it into the woods, loaded it up and tried to but a hole in Bambi.
When I told him that they required a bit of practice, and that you had to get them tuned up, and that this was considered part of the fun, and that I'd be more than happy to show him how to do this, he looked at me like I was nuts.
Make good smoke!