re: Eye-liner
I was having trouble as I have to wear reading glasses, and was finding it virtually impossible to get eye-liner on right.
A tip I was put onto was to use a liquid and put it on in a much wider line than you want, then use a cotton bud in eye make-up remover to take get the right width. If you do it straight away, while still wet, you can get a nice clean edge, without any smudges left behind. This I can do with glasses on.