You stated earlier that you use a baitcaster, well aply that knewledge to your fly fishing. With baitcasting or spinning, if your going to use a smaller lure you'll need to downsize your line wieght. The same goes for fly fishing, the smaller the fly means the smaller tippet you'll what to use. Heavier tippets will cause smaller flies float or sink incorrectly. I feel lighters better, it also gives the fish a fighting chance. As long as you learn something every time you go out, and then aply it the next time, you'll do just fine.

Remember to have FUN! Don't let snapped lines and wind knots get to you, it happens to everyone.
Good Luck!