First of all step back and think "How would I break into my house if I lost my keys".
You will go to where you think it is vunerable, like the half landing window never locked ( bet you went wow, how did he know that). The back door with the key lelft on the inside.
Maybe not, then you remember the little window that would cost 4 quid to replace and pick up the shovel in the garden ( oops fine tool to break in with, thanks says the thief).
Think of that as a risk assesment, then think what you have worth protecting.
Is it worth a DIY system, if so be happy.
If not consider 1st good physical security, some lighting but remember it can aid a thief. An alarm , well I would, best you can afford.
CCTV handy, can catch after the event.
All above are deterents, in one way or another.
Keep valuables out of sight, car and house keys in a draw not on a table by the letterbox ( fishing rods used to snatch keys, and yes it is common).
Use common sence and some preventitive measures and hopefully you will deter the idiots, if your specificially targeted then you have something they know about and want.
Facebook has helped this one, as people or their children post pictures of thier homes and can be pinpointed by the site!!!!
Isnt technology fun!