I am a female with hair just past my shoulders. It is getting a little thick at the moment but doesn't really need a full trim. If I used thinning scissors on my own hair what is the chance of it looking reasonable afterwards?!

I wouldn't reccomend it because you may cut too much off and make it too thin.
It is always best to go to a beauty salon…pay a few dollars and have the professional touch applied to your beautiful hair:)

powered by Yahoo Answers