It Seems That My First Quadcopter Is Ready

OK, it looks like I've finished assembling and configuring my first quadcopter. At least, it takes off the floor and seems to do it smoothly (finally!). Here is a short video:

Now I only have to wait for appropriate weather. Currently in Moscow it's about -2 C (29 F) and a bit snowy and sometimes rainy. Meanwhile, any pieces of advice before the first flight would be very appreciated!

P.S. I know it's bad practice to fly a quadcopter at home and I'm sorry for doing that.