Popping My Girlfriend's Cherry, Scared to do it?

So me and my girlfriend are bisexual, She wants me to be her first,
I'm scared that i will hurt her, Cause i know it hurt when i lost my V-card
I told her she should get someone else to do it, Then i took it back,
I don't know what to do, I am scared to even think about it,
I don't know what i should use, or if i should even attempt to do it,
I don't wanna hurt her, So does anyone have any ideas,
On what i should do and what i should use,
Btw, I'm bisexual, and i'm a girl, please please help
-Thanks