Driving

SO i got my permit yesterday and the funny thing is I didnt think that I would have too many issues with starting the car and moving well it was harder than I thought it was going to be. I did get it eventually and my grandma's son let me take his car onto the road and drive around for a a little bit and lets just say everything was going well until we got to a big I mean huge hill and I couldnt switch gears and get up the hill so my grandma's son came out of the car to switch with me but I took my foot off the brake and it started to roll Ialmost hit a truck but I put the emergency brake on before that could happen thus not causing an accident