How do I make the move?

I really like this conservative girl. We've been hanging out over the last year and I need help in telling her that I really like her....I want to make the move, but I have no experiece. She's very conservative and her parents tried to hook her up in arranged marriages in the past. She's very straightforward and called them off after 1-2 meetings w/ these guys. She's been seeing me exclusively for the last yr and I think she likes me althought she hasn't told me. I've given her gifts for xmas and she's given me gifts. We get along really well...I've spent hr in her bedroom talking. We treat each other like boy and girlfriend although we haven't explicitly said we were. How do I tell her I want to take it to the next level. I need in depth advice as I have absolutely NO prior girlfreind experiences. Help me!!!