Active job

Simple job putting up three floating shelves

Hi, just wondering how much to get someone to come in and put up three floating shelves in our kitchen. They are quite heavy, and need to be secured to the wall studs. Shelves are already finished, just need to be put up. We are not sure on the best way to do this, so that's where you come in. I think they could be done via long bolts into the wall studs, but again, I have neither the tools nor the experience to do it. Thanks, Erin