Easy Vessel Sink Installation 

Try cutting the silicone with a razor knife first. Then use wood or plastic shims. Slowly hammer the shims around the sink to pry it up.

It’s a bidet style toilet seat not a sprayer. To have a sprayer temp controlled you would need it connected to the hot and cold and have a way to adjust or mix the water for the right temp. I found this one on Amazon. a.co/d/4CtE4Yg

You can use the same method. If the old sink drain hole throw the counter top is a tight fit that will help it line up so it’s in the same spot.

I’m not sure. The sink was from home depot and the faucet came from Amazon. That’s all I know