To me they are not really a threat. At night I tend to be a bit wary of mirrors though. I did alot of 'spirit calling' when I was younger with my mates. Didn't realise it was a form of the black arts until a couple of years ago. Me and my mates would do the 'hail satan/bloody mary/candyman' thing and also call upon spirits trapped in the mirror.
They scared me then [especially the candyman ritual - I was young and watched it at a sleepover and then did it in the bathroom]. I have a strong urge to do the bloody mary thing again just to see if what I saw was real or a trick of my eyes - but I get freaked out when I do it in my head let alone doing it outloud. The candyman thing makes me laugh even now - I actually thought he was real for ages until I seen the actor in another film so now I 'call' the candyman all the time just to freak out my little cousin and one of my mates who is very naive for her age.
I have seen things but not head on. Like when I called bloody mary I saw a woman who I assume must have been her and sensed a lot of anger - this woman was clouding my own reflection.

I do a lot of staring at myself in order to see my aura - I've managed to just see the fuzzy whiteness for now cuz I haven't trained my eye to not look away after that has come. But for some reason I only able to do this in the day-time.

When we are young we are so brave and we are fearsome and I miss that part of me that was willing to take risks and do things before thinking them through.

I also did the age-old spells of trying to see who my future husband would be and who my soul-mate is etc.

MIRROR MAGICK from my Black Book
 
An old half silvered mirror or highly polished silver bowl works best. Keep it within your circle. The best place is upon your altar. angle it into a position that you can see into it but not be seen. Do not concentrate upon the mirror while within your circle, but be able to look into it at all times.
 
Mirrors are deadly weapons in the hands of the Yzidi. The best any other sect can do with them is use them for protection or prophesy. Sometimes there is a rare healer or seer who can learn to use them as weaponry, but more often than not they are drawen into the mirror instead of suceeding. If you have one strong enough to use a mirror use great care.
 
A mirror in your circle blessed and consecrated to your way will protect against mirror spells sent against you and those with whome you work, so long as yourself and any with you are not directly reflected in the mirror. If you or any of your way are adept enough you can sometimes see the reflection of a spirit or spell that is drawn into the mirror.
 
When you consecrate a mirror in your circle it should be held reflecting away from you when first within your circle, then reflecting you. Do not permit a reflection of yourself in an ujnconsecrated mirror while within a circle.
 
The weapons of any other than the Yzidi can not be sent through a mirtror, nor can images or spells except by the odd healer or seer. The Yzidi will often mark a victum or one who is going to be a victum by placing a mirror on them in the form of ordamentation. This is usually done by tricking the person into picking up something that is mirrored. This is usually done by using an attraction spell. The mirror helps any of their way or kind to find who ever it is and mark them as an enemy to be taken or destroyed.
 
Mirrors are the best protection in a circle against mirror attacks. There are mirror spells that can be used by many but found by few. If you are in trouble by those who use mirrors there are ways to obtain the information and what you need.
 
A Yzidi with mirror powers and mirror experiance can find a way through most protections or circles by using the angles of the mirror to see through and around.