Hello I'm a newbie

Hello - I have been watching and  feeding birds in my yard for a few years now, but consider myself a novice.  But this is the first year I have hung a nestbox. Two blue tits  have showed an interest in the box over the past two days. I'm so excited!

However as I said I don't have a garden only have a yard about 150 yards long, surounded by a wall about 10 feet high. A 'resident ' blackbird loves to hop between the many pots I have. There are  trees, bushes and ivy down one side of the wall,  with feeders hung on them. On the opposite wall I have feeders hung. I hung the nest box  high up above my kitchen window, I thought this the only safe wall to hang it on as the cat next door won't be able to reach it.

Now I am wondering if I will disturb the blue tits when I am in the kitchen. Also it's that time of year for getting out the power washer to blast the yard...will this frighten or disturb the blue tits?

 I am surprised that I get such a variety of birds in my yard. I live a mile from the town centre but there is a park close by. Any advice will be very welcome. I look forward to posting on the forum in the future.