Congratulations on your 790! My 790 has been really great. What the other guys are saying about cronic problems are indeed true (the battery), all else has been rock solid for me.
Having started as a complete rookie myself, I've learned that practice makes perfect. I really struggled with my FEL at first, but have gotten much more proficient with time. While I don't own a box blade (yet), I'm sure that you'll have similar experiences....
You'll learn a lot my reading the posts and asking questions.... these guys are the experts!
My next two gadgets will be a tooth-bar and an oil-heater (for cold winter starts).