Telling someone that you like them can be pretty scary because you are opening up and being quite vulnerable. I know it can suck to hear this but everyone is different and how you want to go about it is up to you because it is so subjective. You could think about what type of approach you'd like to take - subtle or outright. The subtle approach can be less frightening but there is a chance that they might not get what you are really trying to say. Being outright means that they will get the message but it could leave you feeling more vulnerable. Personally, I would rather just rip the bandaid off and share how I feel because then I can start 'moving on', if it turns out that they don't feel the same.
How are you feeling about it?