How to trim the hair ends at home, without a visit to the salon?

I fear that remain in the hair nits( lice were in the winter, the child picked up, the hair is very long, it is unlikely to comb out all).Therefore, in the barber shop I am ashamed to go, even though I'm not sure that my hair is something wrong.To cut my home no one.As most do it, anyone know a good method?