It is completely safe. It will not fuck up your dreams, you won't deprive your mind of time to store memories or send you subconscious messages, you can't kill yourself, you can't get stuck in a dream, it won't fuck up your brain chemistry, you will still have plenty of normal dreams, it will not make you go crazy or make you think you're dreaming when you're not. Any questions?

No, lucid dreaming is pretty much the safest and most powerful way to explore your mind that exists. About the closest you can come to harming yourself via lucid dreaming is if you lose some sleep one night because you stayed up trying to WILD (and if this happens, you're doing it wrong).

And don't worry about not being able to dream like before. I promise you if you become at all slack in your efforts the lucid dreams will cease promptly. Lol.