Reservation Oslo-Bergen / Bergen-Oslo

Hi,

We want to do Oslo - Bergen on the 23rd and Bergen -Oslo on the 26th (both at night arriving early in the morning the day after). We haven’t done the reservation yet and we are leaving in a week. We are concerned because we can only obtain paper tickets by reserving these trips and we don’t know if buying the ticket in site is the best idea.

Can you help us with this matter?

Thanks :)