Yes, learn it. It will really up your game way above the dry fly and bobber crowd. Don't lock yourself into specifically "Czech" style however. There are a number of EURO nymphing styles that each have advantages for different conditions. Start with getting your hands on DYNAMIC NYMPHING by George Daniel. There are a number of pretty good videos on YouTube and Vimeo that you should find helpful too. Aaron Jasper and Jonathan Barnes are good places to start. Aaron has a series of full lenght DVDs on the subject that are good. Once you get the idea...just get out there an practice. You'll catch on. Most important...know where fish lie. Euro nymphing goes a little bit against the grain of the drag free crowd. It's incredibly effective and the reason they totally beat the pants off North American fly anglers in competitions, ...until we caught on.