I, with the help of a neighbor, installed an overhead light fixture. It was a little awkward and I'm not sure the unit came with the right bracket - it didn't match the one in the instructions. The awkwardness meant that it was impossible to attach the two ground wires to the green screw. The neighbor simply twisted the two ground wires together and added one of those plastic screw on wire connectors. He said it was perfectly safe.
My in-law's house just had a kitchen fire after an electrician had done some work so I'm spooked. Should I have a professional come in and reinstall the light? Is it necessary to use the green screw if the two ground wires are firmly connected?