I'm just returning to fly fishing for river trout after a long break and everything's changed! I'm equipped with a variety of rods and reels that will cover most eventualities so I need advice on fly lines - does a DT5F still exist - and particularly leaders and tippets? I fish upstream dry fly and nymph or downstream wet according to conditions. Baffled by fluorocarbons and braided leaders pros and cons. Help?