First time sex for a girl?

My gf is a virgin and she wants to have sex with me. We've dated for a while and she thinks its been long enough. Im hesitant tho cause she's a virgin and i dont know if it will hurt her. Ive tried fingering her twice before, and even when she's like soaking wet she still says it feels like alot of pressure when i put my finger in too much. So how should i go about her first time? Will it hurt even with enough foreplay?