Being able to tell someone how you feel is a very difficult challenge, especially when it is the first time telling them. Although it is not feasible for every moment of our life to be planned, sometimes planning your words, especially when you are relaying your feelings to someone is the best way to handle things. In order for you to tell someone that you love them, you cant be looking forward to telling them, seeking for them to say the same in return.
If you are doing this just to see a persons reaction then you are probably doing it for the wrong reason. You should only tell someone that you love them when you know in your heart that you do. Of course we all want the person we love to love us back, but getting our feelings off of our chest shouldn't be a ploy to gauge where someone eases feelings. Whatever you do be confident in the fact that you love this person, and know that whatever happens after you tell them how you feel, just happens.
