I'm no pro and have only had one small, short LD a long time ago, but until someone better comes along I can throw in my two cents for you.

The realness of the dream will depend on you. It's all in your head after all. You can gain full control of all aspects of the dream but that takes practice, for obtaining vividness most people will do things like spin around or rub their hands, I think it helps your mind concentrate more on the dream, making it more vivid. I've had dream in third person, dreams that were all blurry as hell, dreams that had some weird perspective (like your telescope thing), etc, but I've also had dreams that were 100% vivid and lifelike, so like I said, it's all in your head and you can control it once you get the hang of it.

DEILD is very cool, I've almost done one myself. It does take a lot of practice but it seems easier than WILD, which is harder than both DEILD and DILD. Basically for DEILD you'll have to get good at realizing you're dreaming, then you just wake yourself up but don't move, let yourself drift immediately back to sleep (which will be your natural reaction if you haven't moved or woken your mind up fully) while remaining aware, and you'll enter a dream, like it will literally feel like your eyes are opening into your dream, you'll be lucid immediately. It does take time like anything else though.

Really the best way to sum everything up is technically anything is possible, but it all takes varying amounts of practice. At first your LDs will probably only last a few seconds because of the excitement level, but the more you have and the longer you practice, eventually you should be able to make them feel like a real long time. Remember, you're trying to do something that most minds would never do naturally. Usually you just dream and if you remember you remember, if not you don't. It will take a long time to get the hang of, but just realize, a dream is all in your head, why shouldn't you be able to control it just like you control your imagination.

Oh and binaural beats are more or less a placebo. If you truly believe it will work then it probably will, because a lot of this LD stuff comes just from accepting and believing it will happen, but if you're not susceptible to that kind of thing and actually expect a measurable, scientific result, it probably won't do anything for you. Let's just say there's plenty of Lucid Dreamers who don't listen to them.

Hope that was some help.