Well you could start by commenting on what you like In her then follow it up by telling her how you feel and that you are hoping that she feels the same way blah blah blah the usual
well... whoever this is... you must tell them. if they say... me too in a way as if embarressed then just say.... yeah ok. then walk away. Sooner or later your'll get the hang of it and you'll be...
one of the biggest mistakes that guys make is trying to be tough. you need to be nice and sensitive!(this applys if you are a guy) first you need to talk to her. or find an activity that you both...
Hang out with them for a while, talk about each others feelings. It is much better if you two are alone. Then after a while, tell them that you like them.