I am helping a little girl right now that has to do this the end of January.
She is doing it on trail riding alone. She has borrowed my husbands old helmet that is broken all around the bottom (the thick Styrofoam is cracked completely) and is skinned up so bad from the rocks he fell on that the brand name has been scratched and gouged out of the shell of the helmet. This is from a fall he took 3 years ago when a colt spooked and ducked out from under him. He landed on the left side of his head in the ricks and broke his left shoulder in 3 places. He was alone and when he came to, he had his cell phone and called me. He did not know what happened or where he was for sure when he first called.
So, she is using his old helmet, a cell phone and has also borrowed a pair of saddle bags and is showing what is always put in them besides 2 water bottles that fit into pockets on one side of them. The other side has big and a small zipper pockets.
Husband healed up and still trail rides (he is 72 and has had a stroke), but I do not let him go off our place by himself anymore. He rides on the same trails, but, I or someone else is close by. I MADE him promise to wear his helmet that day and to keep his phone in his pocket and not in his saddle bags. I do not have to remind him to wear his helmet anymore.